Preheat oven to 375 degrees, and prepare a 12-muffin pan by either greasing the pan or using paper liners.
Mix dry ingredients in a medium to large bowl.
Add vegetable oil and sour cream or yogurt. Beat eggs and add them to the batter. I used plain greek yogurt, so I had to add an additional 1/3 cup of water to make a batter instead of a dough. Stir until thoroughly moistened.
Fold in the blueberries.
Divide the batter into 12 muffins, or a greased and parchment lined 5 x 9 in. loaf pan.
Sprinkle the tops with the reserved granulated sugar.
Bake muffins for 18-24 minutes (choose the shorter time for fresh blueberries, and the longer time for frozen blueberries). Makes 12 large muffins.
For a blueberry muffin loaf, bake 65 minutes or until a knife inserted in the center comes out clean.