Craving a warm, fruity dessert but dreading the oven? We’ve got your lazy summer fix. Our microwave plum crisp delivers juicy summer plums and a buttery, crunchy topping in just 5 minutes flat.
Yes, you read that right—no preheating, no sweating over a hot stove. This recipe is ideal for solo cravings or impromptu dinner parties where time (and effort) are non-negotiable.
Below, we’ll break down how to turn ripe plums and pantry staples into a dessert that’s equal parts cozy and refreshing. You’ll get ingredient swaps, microwave hacks, and even storage tricks for leftovers (if there are any!).
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Lazy Summer Microwave Plum Crisp
Recipe by Lisa MartinCourse: DessertCuisine: American2
5
minutes5
minutes250
kcal10
minutesPlum crisp is a classic dessert that usually requires an oven and a bit of time, but with the convenience of the microwave, you can enjoy this warm, fruity treat in no time. With a sweet and tangy filling topped with a buttery oat crumble, you can indulge in a comforting dessert that's ready in under 10 minutes.
Ingredients
plums
pitted and sliced
rolled oats
brown sugar
all-purpose flour
cinnamon
pinch of salt
butter
melted
lemon juice.
Directions
- In a microwave-safe dish, combine the sliced plums with lemon juice and toss gently to coat.
- In a separate bowl, mix the oats, brown sugar, flour, cinnamon, and salt.
- Pour the melted butter over the oat mixture and stir until crumbly.
- Evenly sprinkle the oat mixture over the plums, covering them well.
- Microwave the dish uncovered on high for 4-5 minutes, or until the plums are bubbly and the topping is golden brown.
- Allow the crisp to rest for a minute or two before serving..
Notes
- For best flavor, use ripe and juicy plums. You can substitute other fruits like peaches or cherries if desired. Serve warm with ice cream or whipped cream for an extra treat. This microwave plum crisp is an ideal dessert for warm nights when cooking is the last thing you want to do!
What is a Plum Crisp?
A plum crisp is summer’s answer to “I want dessert now.” Imagine tender, jammy plums bubbling under a golden-brown crust of oats, flour, and butter. Unlike cobblers (biscuit-topped) or crumbles (simpler streusel), crisps specifically include oats for texture—a rule my grandpa enforced with military precision during our family BBQs.
George, my dad, once attempted a “birthday crisp” using leftover plums from our tree. He microwaved it to avoid heating the kitchen on a 90°F day. We dubbed it “Lazy George’s Miracle” and never looked back. The microwave version skips oven drama but keeps all the cozy chaos of baked fruit desserts.
What Does Plum Crisp Taste Like?
Bite into a spoonful, and you’ll get tart-sweet plums softened into jammy submission, balanced by a buttery, nutty crunch. The fruit’s natural acidity (thanks to malic acid) cuts through the rich topping, while cinnamon or nutmeg adds warmth. Microwaving amplifies the juiciness—plums release more liquid fast, creating mini syrup pools under the crisp. This method of softening fruit can also enhance dishes like grilled stone fruit delight, making them even more luscious. When prepared with a hint of sweetness, these fruits become a delightful treat that highlights their natural flavors beautifully.
Texture-wise? Think crisp vs. squish warfare. The topping won’t get as dry as oven-baked versions, but a 30-second broil finish (if you’re fancy) adds crunch. It’s like eating a pie without the commitment—or pants requirement. Perfect for couch-based summer evenings. This method of cooking is great for various dishes, including a delightful summer squash casserole. A summer squash casserole microwave crunch can turn a simple meal into a crunchy treat that’s easy to prepare and perfect for hot days.
Ready to raid your fruit bowl? Let’s talk plums, swaps, and how to avoid soggy topping disasters. For a delightful twist, consider making an island vibes smoothie bowl using fruits you can microwave. You can combine any fresh or frozen fruits for a refreshing treat, with options for those who prefer warm toppings.
Ingredients for Lazy Summer Microwave Plum Crisp
Our recipe calls for 4 ripe plums (about 1 cup sliced), 1/4 cup rolled oats, 2 tbsp flour, 2 tbsp brown sugar, 1 tbsp melted butter, and a pinch of cinnamon. That’s it! These pantry staples transform into a dessert that’ll make your microwave feel like a Michelin-starred pastry chef. For a quick breakfast option, consider trying microwave cinnamon swirl oats, which provide a warm and comforting start to your day. This simple dish combines oats with cinnamon and a touch of sweetness, making it a delightful way to enjoy the flavors of fall anytime.
Plum Alternatives and Substitutes
No plums? No panic. Swap them for peaches (½ cup sliced), frozen mixed berries (⅔ cup), or even apples (microwaved 1 minute first). Texture matters—choose fruits with 15-20% natural sugar content for balanced sweetness. My neighbor once used overripe nectarines, and we still talk about that batch. For an even lazier option, try pairing your oatmeal with canned peaches for a quick, sweet boost. Lazy microwave instant oatmeal with canned peaches is a delicious and effortless breakfast choice.
Crisp Topping Variations (Oats, Nuts, or Gluten-free)
Mix in chopped pecans (1 tbsp) for crunch or shredded coconut (2 tsp) for tropical vibes. Gluten-free? Replace flour with almond flour or ground oats. For a clumpy topping, add ½ tsp cold water to the mix before microwaving—it’s our secret for faux-baked texture. If you love quick gluten-free desserts, you’ll adore this crisp.
Also See: Carrot Cake for One – Mug and Microwave Magic
How to Make Plum Crisp in the Microwave
Grab a 12-oz microwave-safe mug or bowl. Avoid metal accents—they spark more drama than a reality TV reunion. Layer fruit first, then topping, leaving ½-inch space to prevent magma-like overflow. Experimenting with different fruit combinations can lead to delicious, quick treats, such as a microwave mixed fruit mug. This easy recipe is perfect for satisfying cravings without a lot of hassle.
Preparing the Plums: Fresh Vs. Frozen
Slice fresh plums into ½-inch wedges (no peeling needed). Toss with 1 tsp lemon juice to brighten flavors. For frozen plums, thaw 30 seconds first—they’ll release more juice, so add ½ tsp cornstarch to thicken. Pro tip: Remove pits unless you enjoy dental bill surprises. Canned plums can also be a great shortcut, adding sweetness and moisture to a lazy microwave instant pancake mix. Pairing these plums with pancakes creates a quick and delicious breakfast option with minimal effort.
Can You Microwave the Crisp Topping?
Absolutely! Microwaving melts the butter into the dry ingredients, creating a caramelized crust as it cools. For extra crunch, broil the cooked crisp 1-2 minutes—but let’s be real, we’re here for speed, not oven acrobatics. In fact, many foods that taste even better when microwaved than baked—keeping the flavors vibrant and textures delightful.
Assembling and Microwaving the Crisp
- Layer plums in your mug—press gently to compact.
- Sprinkle topping evenly over fruit—no clump left behind!
- Microwave on high (800W) for 2 minutes. If your microwave is weaker (700W), add 20 seconds.
Watch the magic happen—the topping will puff up like a proud soufflé before settling into crispiness. If juices bubble over, smile: you’ve achieved maximum flavor concentration. To elevate your cooking further, consider using a simple microwave trick that can transform vegetables into tasty, restaurant-quality dishes. This method not only enhances flavor but also ensures they retain their nutrients and vibrant colors.
Also See: Stuffed Rainbow Peppers (Quick Microwave Bake)

Tips for Perfect Microwave Plum Crisp
Use room-temp butter—it blends better with dry ingredients than melted. Forgot to soften it? Grate frozen butter with a cheese grater. Yes, it’s chaotic, but so is adulthood.
Common Mistakes and How to Fix Them
- Soggy topping? Let the crisp rest 2 minutes post-microwave—it crisps as it cools.
- Undercooked fruit? Slice thinner (¼-inch) next time, or microwave 15 seconds more.
- Burnt edges? Stir topping every 30 seconds if your microwave runs hotter than a July sidewalk.
Now that your crisp is perfected, let’s tackle keeping it fresh (if it lasts that long).
Now It’s Your Turn to Whip Up This Easy Dessert!
With just a handful of ingredients and a microwave, you can transform summer plums into a warm, comforting crisp in minutes. The juicy fruit and crunchy topping create a perfect balance—no oven required.
Give this lazy summer dessert a try and let us know how it turns out! Whether you stick with classic plums or experiment with peaches and berries, microwave crisps are endlessly adaptable for sweet cravings.