Name: Apple Oatmeal Crumb Cake
Prep time: 25 min
Cook time: 50 min
Total time: 1 h 30 min
Yield: 12
Cuisine: American
Ingredients: 1½ cups (190g) all-purpose flour; 1 tsp baking powder; ½ tsp baking soda; ½ tsp salt; 1 tsp ground cinnamon; ½ cup (115g) unsalted butter, softened; ¾ cup (150g) granulated sugar; 2 large eggs, room temperature; ½ cup (120g) sour cream or plain yogurt, room temperature; 1 tsp vanilla extract; 3 cups (about 3-4 medium) peeled and chopped apples (Granny Smith or Honeycrisp); ¾ cup (95g) all-purpose flour; ¾ cup (65g) old-fashioned rolled oats; ½ cup (100g) packed light brown sugar; 1 tsp ground cinnamon; ¼ tsp salt; ½ cup (115g) cold unsalted butter, cubed

This delightful Apple Oatmeal Crumb Cake features juicy cinnamon-spiced apples baked into a moist, tender vanilla cake, topped with a thick, buttery oatmeal crumb streusel that turns golden and crisp. It’s the perfect fall breakfast, snack, or dessert – hearty, not too sweet, and full of warm homey flavors.

Why You’ll Love This recipe

You’ll fall in love with this cake because it combines the best of apple crisp and coffee cake in one easy bake – the bottom layer is soft and fluffy with subtle vanilla warmth, while chunks of fresh apples add juicy bursts of natural sweetness and tender texture in every bite.

The star is the thick oatmeal crumb topping: buttery, crunchy, and packed with oats for that satisfying contrast against the moist cake. It’s not overly sugary, letting the apple and cinnamon shine through, and it feels wholesome yet indulgent.

Perfect for cozy mornings with coffee, afternoon tea, or as a crowd-pleasing dessert – it uses simple pantry staples, comes together without a mixer, fills your home with amazing fall aromas, and tastes even better the next day as the flavors meld and the crumb stays crisp.

Yield: 12 slices

Apple Oatmeal Crumb Cake

Moist vanilla apple cake topped with crunchy oatmeal crumb streusel – cozy fall perfection in every bite.

Prep Time 25 minutes

Cook Time 50 minutes

Additional Time 15 minutes

Total Time 1 hour 30 minutes

Ingredients

For the cake:

1½ cups (190g) all-purpose flour
1 tsp baking powder
½ tsp baking soda
½ tsp salt
1 tsp ground cinnamon
½ cup (115g) unsalted butter, softened
¾ cup (150g) granulated sugar
2 large eggs, room temperature
½ cup (120g) sour cream or plain yogurt, room temperature
1 tsp vanilla extract
3 cups (about 3-4 medium) peeled and chopped apples (Granny Smith or Honeycrisp)

For the oatmeal crumb topping:

¾ cup (95g) all-purpose flour
¾ cup (65g) old-fashioned rolled oats
½ cup (100g) packed light brown sugar
1 tsp ground cinnamon
¼ tsp salt
½ cup (115g) cold unsalted butter, cubed

Instructions

Preheat your oven to 350°F (175°C). Grease an 8x8 or 9x9-inch baking pan (or line with parchment for easy lift-out) – this cake is sticky from apples and buttery crumbs!
In a medium bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon for the cake – set aside so everything blends evenly later.
In a large bowl, cream the softened butter and granulated sugar with a whisk or electric mixer until light and fluffy (about 2 minutes) – this incorporates air for a tender crumb.
Beat in the eggs one at a time until fully combined, then mix in the sour cream (or yogurt) and vanilla – the batter will look smooth and creamy now.
Gently fold the dry ingredients into the wet just until no streaks remain – don't overmix to keep it soft!
Toss the chopped apples with a sprinkle of extra cinnamon (and a squeeze of lemon if you like) then fold them into the batter – it'll be chunky and apple-packed. Spread evenly into your prepared pan.
Make the crumb topping: In a bowl, combine flour, oats, brown sugar, cinnamon, and salt. Add cold butter cubes and use your fingers, a pastry cutter, or fork to work it in until it forms large, crumbly clumps (some pea-sized is perfect for crunch).
Sprinkle the oatmeal crumb generously and evenly over the cake batter – pile it high; it shrinks a bit during baking for that thick, irresistible layer!
Bake for 40-50 minutes until the top is golden brown, the edges pull away slightly, and a toothpick inserted in the center comes out clean or with moist crumbs (not wet).
Let the cake cool in the pan on a wire rack for at least 15 minutes – this helps the crumb set. Slice while slightly warm or at room temp, dust with powdered sugar if desired, and enjoy the cozy, crunchy bliss!

Notes

This cake is best slightly warm or at room temperature – the contrast of soft cake and crisp topping is magical. Apples release juice, so a slightly jiggly center is okay as it sets while cooling. For extra indulgence, drizzle with caramel or serve with whipped cream.

Nutrition Information

Yield

Serving Size

1
Amount Per Serving Calories 536Total Fat 19gSaturated Fat 11gUnsaturated Fat 8gCholesterol 76mgSodium 279mgCarbohydrates 83gFiber 5gSugar 33gProtein 9g

The recipes and nutritional information on Yum Tonight are for informational purposes only. Always consult a healthcare provider for personalized dietary advice.

Recipe Tips and Tricks

Use firm, tart apples like Granny Smith or Honeycrisp – they hold shape and balance sweetness without turning mushy.
Make extra crumb topping – it’s the best part; double it if you love crunch!
Toss apples in cinnamon and a bit of lemon juice first to prevent browning and boost flavor.
Don’t press the crumb topping down too hard – leave it loose for maximum crispiness.
Check doneness with a toothpick in the center; it should come out clean or with moist crumbs (not wet batter).
Let the cake cool slightly before slicing – the crumb sets up nicely for clean cuts.
For even baking, rotate the pan halfway through if your oven has hot spots.

Ingredients Notes

Fresh apples (3-4 medium, about 3 cups chopped) are key for juicy pockets – peel them for smoother texture or leave skins on for rustic appeal and extra fiber.

Old-fashioned rolled oats (¾-1 cup) give the topping hearty chew and nutty flavor; quick oats work but yield a finer crumb. All-purpose flour (1½-2 cups total across cake and topping) provides structure.

Butter (½-¾ cup total, unsalted) is essential for richness in both cake and streusel – use cold for topping to create pea-sized clumps. Sugars (granulated for cake tenderness, brown for caramel notes in topping) keep it balanced. Eggs (2 large) and sour cream or yogurt (½-¾ cup) add moisture and tang for a soft crumb.

Warm spices like cinnamon (2-3 tsp total) and optional nutmeg bring cozy fall vibes. Baking powder/soda ensure a good rise, vanilla enhances everything, and a pinch of salt sharpens flavors without overpowering.

Variations and Substitutions

For a gluten-free version, use a 1:1 GF flour blend and certified GF oats. Make it dairy-free with plant-based butter, yogurt, and non-dairy milk if needed. Add chopped walnuts or pecans to the crumb for extra crunch and nuttiness.

Swirl in a layer of apple butter or caramel sauce for deeper flavor. Use pears instead of apples for a gentler twist, or mix in berries for brightness. For a spiced-up version, add ginger, cardamom, or allspice.

Healthier tweaks: reduce sugar slightly, use half whole wheat flour, or Greek yogurt instead of sour cream. Turn it into muffins (bake 20-25 minutes) or a sheet pan cake for crowds. Vegan option: flax eggs, plant butter, and applesauce for moisture. Top with a simple glaze (powdered sugar + milk) or serve warm with vanilla ice cream.

Storage Options

Store at room temperature in an airtight container for up to 3 days – the crumb stays surprisingly crisp. Refrigerate for up to 5 days (cover well); warm slices briefly in the microwave or oven to revive texture.

Freeze individual slices wrapped tightly for up to 2 months; thaw at room temp and refresh in a 300°F oven for 5-10 minutes.