Little Coffee Cakes - Cappuccino Oracle

Ingredients

• 1 cup all-purpose flour
• ½ cup granulated sugar
• ¼ cup brown sugar
• ½ cup unsalted butter, softened
• 1 large egg
• 1 teaspoon vanilla extract
• ½ cup sour cream or yogurt
• 1 teaspoon baking powder
• ½ teaspoon baking soda
• ¼ teaspoon salt
• ¼ cup brown sugar (for streusel)
• ¼ cup flour (for streusel)
• 1 teaspoon cinnamon (for streusel)
• 2 tablespoons unsalted butter, melted (for streusel)