6tablespoonssalted butterat room temperature (cut into squares)
1large egg yolk
Make the crumb topping:
Place the sugars, cinnamon, salt and butter in a bowl. Mix well.
Add the cake flour and mix until a ball forms. Set aside.
Make the cake:
Preheat the oven to 325º Fahrenheit. Spray an 8x8 baking pan with cooking spray.
In a bowl, mix together the flour, sugar, baking soda, and salt.
Add in the coconut oil and butter, mixing until the mixture looks like a crumble.
Add in the eggs, vanilla and buttermilk.
Mix 1-2 minutes until light and fluffy.
Pour the batter into the greased pan. Smooth it evenly.
Take the topping and make small marble sized chunks, sprinkling them over the batter evenly.
Bake for 40-45 minutes or until a toothpick comes out clean.
Allow the cake to cool, then sprinkle with powdered sugar.
The calories shown are based on the cake being cut into 9 pieces, with 1 serving being 1 slice of cake. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**