Sheet-Pan Crumble Cake | Mama's Cooking

Ingredients

• ***For the crumb topping:***
• 1 1/2 cups dark brown sugar, packed
• 2/3 cup granulated sugar
• 1 tablespoon ground cinnamon
• 1 teaspoon kosher salt
• 2 sticks unsalted butter, melted
• 3 cups all-purpose flour
• ***For the cake:***
• 1 3/4 teaspoons baking powder
• 3/4 teaspoon baking soda
• 1 1/2 sticks unsalted butter, room temperature
• 1 3/4 cups granulated sugar
• 3 large eggs
• 1 tablespoon pure vanilla extract
• 1 1/4 cups sour cream