These Buttermilk Blueberry Muffins are soft and fluffy, bursting with delicious blueberries and topped with a buttery cinnamon streusel. They are perfect for breakfast but they may disappear right out of the oven no matter the time of day.
Add sugar, flour and cinnamon in a small mixing bowl and stir together with a whisk to distribute evenly. Toss in the cold cubed butter and cut with a pastry blender or a fork until the texture is sandy. Refrigerate until ready to use.
Prepare the muffin batter
Preheat the oven to 375°F.
Brush a 6-cavity jumbo muffin pan with some melted butter and sprinkle 1 tablespoon of flour over it to cover the surfaces of the cups completely. Tap out any excess if necessary.
Wash and dry the blueberries slightly. Add 1 1/2 cup to a small mixing bowl and toss with 1 tablespoon of flour. Set the other 1/2 cup of blueberry aside.
Add the remaining flour to a medium mixing bowl along with salt, baking powder, baking soda and stir together with a whisk to distribute evenly. Set aside.
In the stand mixer bowl fitted with the paddle attachment, cream softened butter and sugar together until light and fluffy.
Lightly beat the egg together with buttermilk and vanilla in a measuring cup, pour the mixture in with the butter. Beat to incorporate.
With the mixer on the lowest speed, slowly pour in the flour mixture and mix until just combined.
Add the blueberries that have been mixed with flour to the batter and lightly fold with a spatula until all the berries are evenly distributed.
Use a large ice cream scoop to divide the batter evenly among 6 cups of the prepared muffin pan. Top each muffin with about 1 1/2 tablespoon of cinnamon streusel, and add a few extra blueberries set aside earlier over the top.
Bake for 28 minutes in the middle of the oven until an inserted toothpick comes out clean.
Remove from the oven and set the pan on a wire rack to cool to the touch. Remove muffins from the pan and allow to cool completely on a wire rack.
Notes
Allowing all the refrigerated ingredients to come to room temperature before mixing will ensure they combine smoothly.
This recipe can also be used to make 11-12 regular size muffins, reduce the oven temperature to 350°F and the baking time to approximately 20 minutes.
Best serve warm. To reheat, wrap in a damp paper towel and microwave for 15 seconds.