Beat eggs; gradually add sugar. While beating, slowly add oil and vanilla.

Combine dry ingredients in a separate bowl. Add alternately with sour cream to the egg.

Gently fold in blueberries.

Bake in preheated oven at 400F for 18-20 minutes in muffins papers or greased pan for very large muffins. Insert a toothpick into the center of the largest one to test for doneness. If it comes out dry and clean, the muffins are done.