Ingredients

• 1/4 cup all-purpose flour
• 1/2 teaspoon ground cinnamon
• 1/4 cup firmly packed light brown sugar
• 2 tablespoons unsalted butter, cut into 1/2 inch pieces
• 1 cup fresh blueberries (unthawed) or 1 cup frozen blueberries (unthawed)
• 2 cups all-purpose flour, plus
• 1 tablespoon all-purpose flour
• 2/3 cup granulated sugar
• 2 teaspoons baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon salt
• 1 large egg
• 1 -1 1/4 cup buttermilk
• 1 teaspoon vanilla extract
• 3 tablespoons unsalted butter, melted and cooled

Instructions

1. To make the crumble topping, in a medium bowl, combine the flour, cinnamon, and brown sugar.

2. Add the butter pieces and cut into the sugar mixture with a pastry blender until the topping is crumbly; set aside.

3. To make the blueberry muffins, preheat the oven to 350 degrees F.

4. Generously butter or grease six 8-ounce jumbo muffin cups.

5. If using fresh blueberries, rinse and thoroughly dry the berries.

6. In a small bowl, toss the fresh or frozen berries with the 1 tablespoon flour.

7. In a large bowl, stir together the 2 cups flour, sugar, baking powder, baking soda, cinnamon, and salt; make a well in the center.

8. In a medium bowl, whisk together the egg and 1 cup of the buttermilk until combined.

9. Whisk in the vanilla and melted butter.

10. Pour the buttermilk mixture into the well.

11. Begin stirring the liquids, gradually drawing the dry ingredients into the well until they are almost, but not quite, combined.

12. If mixture is to thick, add the additional 1/4 cup of buttermilk and gently mix.

13. Add the blueberries and fold in just to distribute evenly taking care not to overmix.

14. Evenly divide the crumble topping among the muffins, sprinkling it on top.

15. Bake the muffins for 30 to 35 minutes, or until a toothpick inserted into the center of a muffin comes out clean.

16. Cool in the pan on a wire rack for 10 minutes, then carefully turn out onto the rack.

17. Serve warm, or cool completely.

18. Store in an airtight container at room temperature for up to 2 days.