In a medium bowl, sift the flour, baking powder, baking soda, and salt. Set aside.
2 cup All-purpose flour, 1 tsp Baking powder, 1/2 tsp Baking soda, 1/2 tsp Salt
In a large bowl using a mixer, beat the butter, oil, sugar, and brown sugar on high speed for 2 minutes.
1/2 cup Unsalted butter, 2 TBSP Oil, 3/4 cup White granulated sugar, 1/4 cup Brown sugar
Add in the sour cream, vanilla, and eggs. Mix on medium. Add in the dry ingredients, buttermilk, and mini chocolate chips. Mix on low speed until just combined. Scrape the bowl.
1 tsp Pure vanilla extract, 2 Large eggs, 1/2 cup Sour cream , 3/4 cup Buttermilk, 1 cup Mini chocolate chips
Spread the cake batter into the pan and spread evenly. Use a cookie scoop to scoop the cheesecake batter into dollops on top. Use an icing offset spatula to spread the cheesecake batter evenly.
Take the crumble out of the fridge and break up any large chunks with your fingers. Sprinkle the crumble on top of the cheesecake layer.
Bake for 40-50 minutes until a toothpick inserted comes out clean.
Let the cake sit in the hot pan for 20 minutes before transferring to a cooling rack. Cool completely before icing.