These homemade Cinnamon Streusel Muffins are the perfect blend of a fluffy muffin and a cinnamon-sugar crunch on top. They're the best treat for a cozy breakfast or a sweet afternoon pick-me-up.
Step 1: Preheat the oven to 375 °F. Line a muffin tin with paper liners or spray with non-stick cooking spray.
Step 2: In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
Step 3: In a separate large mixing bowl, cream together the butter and sugar until light and fluffy. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
Step 4: Add the dry ingredients to the wet ingredients, alternating with the sour cream, and mix until just combined.
Step 5: In a small bowl, mix together the ingredients for the streusel topping until crumbly.
Step 6: Spoon the muffin batter into the prepared muffin tin, filling each muffin cup about ⅔ full. Sprinkle the streusel topping evenly over the top of each muffin.