0.5cupunsalted butter, softened at room temperature
1cupsour cream
3largeeggs, at room temperature
2teaspoonsbaking powder
1teaspoonbaking soda
1teaspoonvanilla extract
0.5teaspoonsalt
0.5cupbrown sugar, tightly packed
0.25cupall-purpose flour
1tablespoonground cinnamon
0.25cupunsalted butter, melted
0.5cupchopped pecans (optional but recommended for added crunch)
Instructions
Preheat your oven to 350°F (175°C) and prepare a 9x13 inch baking pan by greasing it lightly with butter or non-stick spray.
In a large mixing bowl, cream together the softened butter and granulated sugar using an electric mixer until light and fluffy, about 2-3 minutes. Add the eggs one by one, mixing well after each addition. Stir in the sour cream and vanilla extract until smooth.
In a separate medium bowl, whisk together the flour, baking powder, baking soda, and salt. Gradually fold the dry ingredients into the wet mixture using a spatula, mixing gently until just incorporated.
In another medium bowl, combine the packed brown sugar, flour, and ground cinnamon. Drizzle the melted butter over the mixture and mix until crumbly. If using pecans, fold them into the streusel mixture now.
Pour half of the cake batter into the prepared baking pan, smoothing it out evenly. Sprinkle half of the streusel topping over the batter. Pour the remaining cake batter on top and spread it carefully. Finish by sprinkling the remaining streusel topping over the surface.
Bake for 30-35 minutes. To check for doneness, insert a toothpick into the center; it should come out clean or with a few moist crumbs.
Allow the cake to cool in the pan for about 10 minutes, then transfer to a wire rack to cool completely. Slice into squares and enjoy with your favorite cup of coffee.
Notes
For an enticing presentation, dust the top of the cooled cake with powdered sugar and serve each piece with a dollop of whipped cream or a scoop of vanilla ice cream for an indulgent treat.