Make the crumb topping. In a small bowl combine the 1 cup flour, 1/2 brown sugar, 1/4 cup granulated sugar, 1/4 -1/2 tsp cinnamon, and 1/4 tsp salt.

Use a pastry cutter to cut in the ½ cup butter or pinch the butter into the mixture with your fingers gently until small clumps are formed no larger than the size of a pea.

Place in the fridge while you make the cake.

Preheat the oven to 350°F. In the bowl of a hand or stand mixer fitted with the paddle attachment, cream the butter for one minute. Scrape down the sides and add the 1 cup sugar. Cream for 2 minutes on medium speed until light and fluffy.

Scrape the bowl again and add the egg and 1 tsp vanilla extract. Mix on medium speed until combined, about 1 minute.

In a separate bowl combine 2 cups flour, ½ tsp kosher salt ½ tsp cinnamon and ¼ tsp baking soda. Mix lightly with a fork or whisk to combine.

Alternate adding the dry ingredients with the buttermilk starting and ending with the dry ingredients- ⅓ at a time- mixing in between each addition.

Take the remaining ½ tbsp flour and dust it over the sliced apples. Mix to combine and add to the batter, mixing lightly.

Spray a 10” springform pan with baking spray and pour in the batter.

Top with the crumb topping and bake for 50-55 minutes on until the cake is no longer jiggly.

When the cake is cooled, mix together the ½ cup confectioners sugar with 1 tbsp cream and drizzle all over the cake.