In a large bowl, combine the flour, sugar, baking powder, baking soda and salt; add berries and toss gently. In another bowl, combine the eggs, sour cream, oil and vanilla.
Stir the wet ingredients into the dry ingredients just until moistened.
Fill greased muffin cups two-thirds full.
For the topping, combine the all-purpose flour, cereal, sugar, cinnamon and butter.
Top the muffins with the struessel.
Bake at 400° for 18-22 minutes or until a toothpick inserted near the center comes out clean.
Cool for 5 minutes before removing from pan to a wire rack. Serve and enjoy!