Blueberry Buckle Muffins

Blueberry Buckle Muffins great for Breakfast or Brunch
Ingredients:
2 cups Flour,
2 tsp Baking Powder,
1 tsp Cinnamon,
2 tsp Vanilla,
1/2 tsp Salt,
1/2 cup Butter (softened),
2 Eggs (beaten),
1 cup Sugar,
1/2 cup Sour Cream,
1/2 cup Plain Yogurt,
1-1/2 cups Blueberries

Topping:
3/4 cup Flour,
1/3 cup Oats,
1/3 cup Brown Sugar,
4 tbsp Butter (softened),
1 tsp Cinnamon