Brown Butter Crumble:

• Preheat oven to 350F (conventional / no fan) and prepare a 9" cake pan with parchment paper
• Place the butter in a nonstick pan and melt over medium-low heat. Continue to cook and stir until the butter becomes brown - it will become frothy and bubbly first, but keep stirring until you see brown bits in the butter and it smells very nutty. Do not overcook as it can burn easily
• Add the flour, brown sugar, cinnamon and salt to a bowl, and whisk until combined and no lumps remain
• Pour in the browned butter. Use a spoon to mix the butter into the dry ingredients gently. It will become crumbly as you do this; do not overmix, only mix until no dry streaks of flour remain
• Place in the fridge 

Cake:

• Add the sugar, melted butter and oil to a bowl and whisk for 2-3 minutes. It's ok if the sugar doesn't fully dissolve
• Add the vanilla and eggs, and whisk for another 2 minutes so until the mixture becomes smooth, caramel-y and lighter in color
• Add the sour cream and whisk until it is combined. Scrape your bowl, if needed
• Sift in the flour, salt, baking powder, and baking soda. Whisk very gently until just combined and no lumps remain; do not overmix

Cinnamon Apples:

• Cut the apples into small cubes and toss with cinnamon in a bowl

Assembly and baking:

• Spread the cake batter in the prepared 9" cake pan
• Top with a layer of the cinnamon apples
• Bring the crumble out of the fridge and use your hands to spread it on top of the apples. It should be in chunks, and doesn’t have to be perfect! I like to save a little crumble, thinly slice some apples and add to the pan for decoration before sprinkling over the remaining crumble (see images in blog post above)
• Bake at 350F for ~50-55 minutes. Test with a toothpick inserted in the middle at the 45 minute mark; it should have light crumbs but no wet batter. If the crumble is becoming too dark, you can cover the pan with aluminum foil as the cake continues to bake
• Let the cake rest in the pan for 30 minutes before carefully taking it out
• If adding icing, mix the sugar and cream / milk to your desired consistency and drizzle on top of the cake with a whisk or spoon
• Slice & serve!

 

Video Tutorial:

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