This 4-ingredient apple crumble keeps fall dessert deliberately simple. There is no pastry to roll, no mixer to use, and no long ingredient list. Apples create the soft fruit layer, while oats, brown sugar, and butter become a crisp topping as the dessert bakes.
The simplicity works because each ingredient has a clear job. Apples provide moisture and acidity, oats add structure and chew, brown sugar brings caramel flavor, and butter binds the topping while helping it brown.
It is an especially useful recipe for beginners because doneness is easy to judge: the apples should be tender, the topping should be golden, and the juices should bubble visibly around the edges.
Quick Answer
A 4-ingredient apple crumble can be made with apples, old-fashioned rolled oats, brown sugar, and butter. Bake until the topping is golden, the fruit bubbles around the edges, and a knife slides easily into the apples.
Why This Recipe Works
Old-fashioned oats create a crisp topping without requiring flour.
Brown sugar adds caramel flavor and blends with the apple juices.
Butter creates rich clusters rather than a dry oat layer.
Apples remain the dominant flavor because the ingredient list is short.
The recipe is forgiving and easy to judge by visual cues.
Ingredient Notes
Apples
Use apples that soften but keep some structure. Mixing tart and sweet varieties gives better balance.
Old-fashioned rolled oats
They create more distinct texture than quick oats.
Brown sugar
Adds moisture and caramel depth.
Salted butter
Adds richness and enough salt to prevent the crumble from tasting flat.
Ingredients
- 6 cups peeled and sliced apples
- 1 cup old-fashioned rolled oats
- 3/4 cup packed light brown sugar
- 6 tablespoons salted butter, softened
Directions
Prepare the baking dish
Heat the oven to 375°F. Lightly grease an 8-inch or 9-inch baking dish.
Arrange the apples
Spread the sliced apples evenly across the bottom of the dish. Try to keep the slices similar in thickness so they soften at the same rate.
Make the crumble topping
Combine the oats and brown sugar. Work the softened butter into the mixture with your fingertips until moist clusters form.
Cover the fruit
Scatter the oat mixture evenly over the apples. Keep the topping loose rather than pressing it down.
Bake until bubbling
Bake for 35 to 45 minutes. The topping should be golden, the juices should bubble around the edges, and a knife inserted into a thick apple slice should meet very little resistance.
Expert Tips
Use a mix of tart and sweet apples if possible.
Slice apples to a similar thickness for even baking.
Do not compact the topping because loose clusters become crisper.
Let the crumble rest for 10 to 15 minutes after baking so the juices thicken slightly.
If the topping browns too quickly, loosely cover the dish with foil while the apples finish softening.
How to Know It Is Done
Look for active bubbling around the edge and a golden oat topping. The fruit should be tender enough that a knife slides into a thick apple slice easily, but the apples do not need to become completely soft or puréed.
Troubleshooting
Why is the topping soggy?
The apples may have released a lot of juice or the crumble may need more baking time. Continue until the edges bubble actively.
Why are the apples still hard?
The slices may be too thick or the dessert simply needs more time.
Why is the topping greasy?
Too much butter or tightly compacted topping can make the surface heavy.
Why is the dessert watery?
Some apple varieties release more liquid. Resting after baking helps the juices thicken.
Variations
Cinnamon apple crumble
Add 1 teaspoon ground cinnamon to the apples.
Pecan crumble
Add 1/2 cup chopped pecans to the oat topping.
Pear and apple crumble
Replace part of the apples with firm ripe pears.
Individual crumbles
Divide the ingredients among ramekins and reduce the baking time.
Serving Suggestions
Serve warm by itself or with vanilla ice cream. For a lighter option, serve a small portion with plain Greek yogurt. The crumble is also good at room temperature once the topping has fully set.
Storage
Cool completely and refrigerate leftovers in a covered container for up to 4 days.
Freezing
Freeze cooled portions in airtight containers for up to 2 months. Reheat in the oven for a crisper topping.
Frequently Asked Questions
What apples are best for apple crumble?
Choose apples that soften while keeping some shape. A mix of tart and sweet varieties usually gives the best flavor.
Should I peel the apples?
You do not have to, but peeled apples create a softer, more traditional filling.
Can I use quick oats?
Yes, but old-fashioned oats give a better crumble texture.
Can I prepare apple crumble ahead?
Yes. Keep the apples and topping separate, then assemble before baking.
Can I freeze it?
Yes. Freeze after cooling and reheat until hot.
