Preparation Steps

• Preheat oven to 375°F (190°C). Line a 12-cup muffin tin with paper liners or grease it well.
• For the streusel topping: In a small bowl, combine flour, brown sugar, and cinnamon. Cut in the cold butter with a pastry blender or your fingers until the mixture resembles coarse crumbs. Set aside.
• For the muffin batter: In a large bowl, whisk together flour, granulated sugar, baking powder, cinnamon, and salt.
• In a separate medium bowl, whisk together the egg, milk, and vegetable oil.
• Pour the wet ingredients into the dry ingredients and stir just until combined. Do not overmix.
• Divide the batter evenly among the prepared muffin cups, filling each about two-thirds full.
• Sprinkle the streusel topping generously over the batter in each muffin cup.
• Bake for 18-22 minutes, or until a wooden skewer inserted into the center of a muffin comes out clean.
• Let the muffins cool in the tin for a few minutes before transferring them to a wire rack to cool completely.