Fudgy Chocolate Crumb Cake – Brownie Mischief

Ingredients

• 1 cup (128g) all purpose flour
• 1/3 cup (66g) packed brown sugar
• 3 tablespoons (38g) granulated suger
• 2 tablespoons (12g) Dutch process unsweetened dark cocoa powder
• 1/8 teaspoon fine sea salt
• 7 tablespoons (99g) cold, unsalted butter, cubed
• 1 1/4 cups (160g) all purpose flour, sifted
• 6 tablespoons (35g) Dutch process unsweetened dark cocoa powder, sifted
• 3/4 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon fine sea salt
• 1/2 cup (113g) unsalted butter, softened
• 2/3 cup (132g) granulated sugar
• 1/4 cup (50g) packed brown sugar
• 2 tablespoons (30ml) vegetable oil or neutral oil of your choice
• 1 large egg
• 1 large egg yolk
• 1 1/2 teaspoons pure vanilla extract
• 2/3 cup (150g) sour cream
• 2/3 cup (118ml) hot coffee or espresso
• 1/3 cup (85g) semisweet mini chocolate chips
• Powered sugar for sprinkling