Making Fresh Blueberry Muffins with Streusel Topping is simple and enjoyable. Follow these steps for delicious results:

1. Preheat Oven: Preheat your oven to 375°F (190°C). Prepare a muffin tin by lining it with paper liners or greasing it with cooking spray.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, granulated sugar, baking powder, baking soda, and salt until well combined.
3. Combine Wet Ingredients: In another bowl, mix the buttermilk, melted butter, eggs, and vanilla extract until smooth.
4. Combine Mixtures: Slowly pour the wet ingredients into the dry ingredients, stirring gently until just combined. Be careful not to overmix; a few lumps are okay.
5. Add Blueberries: Gently fold in the blueberries, ensuring they’re evenly distributed throughout the batter.
6. Prepare Streusel Topping: In a small bowl, combine the flour, brown sugar, and cinnamon. Add the cold butter cubes and use your fingers or a fork to mix until the mixture resembles coarse crumbs. Stir in oats if desired.
7. Fill Muffin Tins: Spoon the batter into the prepared muffin tin, filling each cup about ¾ full. Sprinkle the streusel topping generously over each muffin.
8. Bake: Place the muffin tin in the preheated oven and bake for 20-25 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool: Remove the muffins from the oven and let them cool in the tin for about 10 minutes before transferring them to a wire rack to cool completely.

Following these steps will lead you to create the ultimate Fresh Blueberry Muffins with Streusel Topping that everyone will love!