Brown Butter Apple Crumble Cake

This brown butter apple crumble cake is one of those recipes that makes your whole kitchen smell incredible. It’s soft, buttery, loaded with apples, and has a crunchy crumble topping that ties everything together.

The secret here is the brown butter. Instead of just melting the butter and moving on, you cook it a little longer until it turns golden and smells nutty. It adds so much flavor without any extra effort.

The cake itself is tender and moist thanks to a bit of sour cream in the batter. Then you fold in diced apples and top the whole thing with a simple oat crumble.

It works beautifully as a dessert, but honestly it’s just as good with a cup of coffee in the morning. No judgment here.

If you’ve never browned butter before, don’t worry. It’s really easy and I’ll walk you through it step by step.

Why You’ll Love It

Brown Butter Changes Everything – Browning the butter adds a deep nutty flavor that makes this cake taste way more special than a regular apple cake.

That Crumble Topping Is Irresistible – The oat crumble gets golden and crunchy in the oven and gives every bite an amazing buttery texture contrast.

Perfectly Moist Thanks to Sour Cream – The sour cream keeps this cake incredibly soft and tender even a day or two after baking.

Recipe Ingredients

For the Cake

• 1/2 cup Unsalted Butter
• 3/4 cup Granulated Sugar
• 2 Large Eggs
• 1 tsp Vanilla Extract
• 1 1/2 cups All-Purpose Flour
• 1 1/2 tsp Baking Powder
• 1/2 tsp Ground Cinnamon
• 1/4 tsp Salt
• 1/2 cup Sour Cream
• 2 Medium Apples, peeled and diced

For the Crumble Topping

• 1/2 cup All-Purpose Flour
• 1/3 cup Light Brown Sugar, packed
• 1/4 cup Cold Unsalted Butter, cubed
• 1/2 cup Old-Fashioned Rolled Oats
• 1/2 tsp Ground Cinnamon

Directions

Step 1

In a light-colored saucepan, melt 1/2 cup of butter over medium heat. Continue cooking, swirling occasionally, until the butter turns golden brown and has a rich nutty aroma, about 5 minutes. Pour it into a large bowl and let it cool for 10 minutes.

Step 2

Add the granulated sugar to the brown butter and whisk until combined. Add the eggs one at a time, whisking well after each. Stir in the vanilla extract.

Step 3

In a separate bowl, whisk together 1 1/2 cups flour, baking powder, 1/2 tsp cinnamon, and salt. Add the dry ingredients to the brown butter mixture in two additions, alternating with the sour cream, stirring gently until just combined. Fold in the diced apples.

Step 4

Preheat your oven to 350F. Grease a 9-inch round cake pan or 8×8 inch square pan and line the bottom with parchment paper. Pour the batter into the prepared pan and spread it evenly.

Step 5

Make the crumble topping by combining 1/2 cup flour, brown sugar, oats, and 1/2 tsp cinnamon in a bowl. Add the cold cubed butter and use your fingers to pinch and rub everything together until you have a mixture of coarse, chunky crumbs.

Step 6

Scatter the crumble topping evenly over the cake batter. Bake for 45 to 50 minutes, until the crumble is deeply golden and a toothpick inserted in the center of the cake comes out clean.

Step 7

Let the cake cool in the pan for 20 minutes before slicing. Serve warm or at room temperature.

My Tips

Use a Light-Colored Pan for the Brown Butter

Brown butter can go from perfectly nutty to burnt in seconds. A light-colored saucepan lets you actually see the butter changing color so you can pull it off the heat at the right moment.

You’re looking for a golden amber color with little brown specks at the bottom. If you use a dark pan, you won’t be able to see any of that and you’ll probably end up with bitter, burnt butter.

Once it smells nutty and looks golden, pour it out of the hot pan immediately into your mixing bowl. The hot pan will keep cooking it even after you turn off the heat.

Keep the Crumble Butter Cold

The butter for the crumble topping needs to be cold – straight from the fridge, cut into small cubes. If the butter is soft or room temperature, it’ll just melt into the dry ingredients and you’ll end up with a paste instead of chunky crumbs.

Work quickly when you pinch the butter into the flour mixture. You want to see visible pea-sized chunks of butter mixed in with sandy, loose crumbs. That’s what gives you that crispy, textured topping after baking.

If your kitchen is warm, pop the cubed butter back in the fridge for 10 minutes before you start making the topping.

Choose the Right Apples

Go with firm apples like Granny Smith, Honeycrisp, or Fuji. These hold their shape during baking so you get nice little chunks of apple in every bite instead of mushy applesauce pockets.

Dice them into small pieces, about half-inch cubes. If the pieces are too big, they’ll sink to the bottom and create soggy spots in the cake. Smaller, even pieces distribute better throughout the batter.

More Recipes

• Salted Honey Butter Cake
• Sticky Toffee Pudding
• Strawberry Crumble Bars

Frequently Asked Questions

How do I know when the butter is properly browned?

You want to look for a golden amber color and tiny brown specks at the bottom of the pan – that is when you know it is ready. It will also smell noticeably nutty and toasty, almost like caramel.

Make sure you use a light-colored saucepan so you can actually see the color change. In a dark pan, it is really easy to accidentally burn it because you cannot tell how dark it is getting.