Heat oven to 350°.Coat muffin tin with cooking spray or liners.Combine flour, sugar, oats, baking powder, baking soda and salt in a bowl.Combine yogurt, eggs, butter, and vanilla in a second bowl.Fold yogurt mixture into dry mixture; stir to combine completely.Gently fold in blueberries.Spoon into muffin tins (don't be afraid to fill them full).Bake until top is golden and springs back when you gently touch it, 20-25 minutes.