Preparation Steps

• Preheat oven to 350°F (175°C). Grease and flour a 9-inch square baking pan.
• In a large bowl, whisk together the flour, baking powder, baking soda, and salt.
• In a separate bowl, combine the granulated sugar, brown sugar, oil, sour cream, eggs, and vanilla extract. Beat until smooth.
• Gradually add the wet ingredients to the dry ingredients, mixing until just combined. Stir in the coffee.
• Pour the batter into the prepared pan.
• In a small bowl, combine all streusel ingredients until crumbly. Sprinkle evenly over the batter.
• Bake for 35-40 minutes, or until a wooden skewer inserted into the center comes out clean.
• Let cool in the pan before serving.