Mom's Best Recipes
Recipe

Easy Plum Crisp

Jammy plums, bright lemon, and a buttery oat topping that bakes up golden and crunchy.

Author By Matt Campbell
4.8
A golden-brown plum crisp in a white ceramic baking dish on a wooden table, with jammy purple-red fruit bubbling around the edges and a spoon resting nearby
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Plums are the underrated heroes of the fruit drawer. They are sweet, tangy, and a little dramatic in the best way. The second they hit heat, they turn into this glossy, jammy situation that tastes like you tried harder than you did.

This plum crisp is my favorite low-drama dessert move: slice fruit, toss with lemon and a little sugar, then bury it under a buttery oat topping that bakes into crisp edges and crunchy clusters. It is cozy, bright, and basically begging for vanilla ice cream.

Whole ripe plums, rolled oats, flour, brown sugar, butter, and a lemon arranged on a light kitchen counter with soft natural window light

Why It Works

  • Plums do the heavy lifting: their natural sweet-tart flavor turns jammy and fragrant in the oven without needing a lot of sugar.
  • Cornstarch keeps it saucy, not soupy: it thickens the juices into a spoonable fruit layer that holds together instead of running everywhere.
  • Cold butter makes crunch: rubbing cold butter into the topping creates crisp, golden bits and tender crumble.
  • Lemon + salt = louder flavor: a little acid and salt make the fruit taste more like itself, just turned up.

Pairs Well With

Recommended

Easy Plum Jam

Easy Plum Jam

A small-batch plum jam that tastes like peak summer. Made with plums, sugar, lemon, and a pinch of salt. No pectin, just patient simmering and bold flavor.

Easy Cherry Crisp

Easy Cherry Crisp

Jammy cherry filling, buttery oat topping, crisp edges. This cherry crisp is simple, flexible (fresh or frozen fruit), and basically made for vanilla ice cream.

Easy Crumble Topping

Easy Crumble Topping

A reliable, no-fuss crumble topping with big crunchy clusters. Works for apple crisp, berry crumble, muffins, and coffee cake. Make it in minutes.

Apple Crunch

Apple Crunch

Tender spiced apples under a buttery brown sugar oat crunch. Quick to prep, bakes golden, and tastes like fall in a spoon.

Storage Tips

Fridge: Cover the baking dish or transfer to an airtight container and refrigerate up to 4 days. The topping will soften a bit, but the flavor stays great.

Reheat for crisp edges again: Warm in a 350°F oven for 10 to 15 minutes until bubbly at the edges. The microwave works for speed, but the oven brings back the crunch.

Freeze: Freeze cooled crisp in an airtight container up to 2 months, but for best topping texture, aim for 1 month. The topping will lose some crunch in the freezer. Thaw overnight in the fridge, then reheat at 350°F until hot through and the top perks back up.

Common Questions

What kind of plums should I use?

Most ripe plums work beautifully. I love black plums for deeper flavor and color, and red plums for a brighter tartness. The one wildcard is juiciness: some varieties bake looser than others. If your plums are extremely juicy or very soft, bump the cornstarch up by 1 to 2 teaspoons.

Bonus tip: freestone plums are easier to pit than clingstone, but either is totally fine.

Do I need to peel plums for crisp?

Nope. Plum skins soften as they bake and add gorgeous color. Just slice and go.

How ripe is “ripe enough”?

You want plums that give slightly when you press them, but are not leaking or mushy. Very underripe plums can taste flat after baking, so let them sit on the counter a day or two if needed.

Can I reduce the sugar?

Yes. If your plums are very sweet, you can drop the filling sugar to 2 tablespoons. Keep a little sugar though. It helps draw out the fruit juices (which is good for that jammy vibe), and the cornstarch is what thickens those juices into a spoonable filling.

Why is my crisp watery?

Usually it is one of three things: you skipped thickener, your fruit was extra juicy, or you cut into it while it was piping hot. Let the crisp cool for 15 to 20 minutes so the juices set up. Also make sure you are seeing bubbling in the center, not just the edges, before pulling it from the oven.

Can I make it gluten-free?

Yes. Use a 1:1 gluten-free flour blend in the topping and make sure your oats are certified gluten-free.

What if I do not have an 8x8 pan?

A 9x9 works great and may bake a few minutes faster since the filling is a bit thinner. A 7x11 is also fine. No matter the pan, bake until the topping is deeply golden and the filling is bubbling in the center.

Can I make it ahead?

Yes. For best texture, mix the topping and refrigerate it (covered) up to 2 days. Slice and toss the plums, then bake right away when you can. If you assemble the whole dish and let it sit, the fruit will release more juice and the topping can soften, still delicious, just a little less crisp.

Sliced plums tossed with sugar and lemon in a ceramic baking dish on a kitchen counter, ready for the topping

I started making fruit crisps when I realized I could get the comfort of pie without the part where I pretend I am calm while rolling dough. Plums quickly became my favorite because they bake into this punchy, winey sweetness that tastes like late summer even if you are making it on a random Tuesday. Also, I am absolutely the person who “tests” the topping with a pinch of salt and a suspicious amount of brown sugar. Quality control is important.