Combine the softened butter, flour, and sugar in a cup, stirring with a spoon until well mixed. Set aside.
Create Muffins
Spray the muffin tins (or add liners) and set aside.
In a stand mixer on LOW. Cream the butter and sugar until fluffy.
Add Eggs, Vanilla and Sour Cream. Increase speed to MED until well incorporated.
In a separate bowl combine dry ingredients. Slowly add the mix slowly on LOW speed.
Lastly mix in blueberries on LOW as to keep most of them whole.
Scoop ¼ Cup mix into each muffin and sprinkle streusel crumbles over the top.
Bake until clean toothpick test is clean (24-28 minutes).
Notes
· Eggs: Eggs act as a binder, which means they help hold the batter together.· Sugar: Makes everything taste delicious. · Baking Powder: Leavening (rising) agent to make them fluffy.· Salt: Enhances the overall flavor.· Sour Cream: Adds to the moisture and enhances the overall flavor.