1. Preheat the Oven to 400F. Grease the muffin cups.
2. Combine the dry ingredients.
3. place vegetable oil in a 1cup measuring cup. Add the egg and enough buttermilk to bring it 1 cup mark. Mix this with the flour mixture.
4. Fold in the blueberries.
5. Fill the muffin cups and sprinkle the crumb topping. (To make the crumb topping - combine all the ingredients in a flat bowl using a fork and keep mixing until it resembles bread crumbs).
6. Bake for 20 -25 mins or until done. (Insert a toothpick in the center of the muffin and check if it comes out clean).

Recipe and image courtesy: My Cooking Journey