These are by far, the best muffins I have ever made. You can substitute the blueberries for chocolate chips, strawberries, or anything else.
1 ½ cups flour
¾ cup sugar
½ tsp salt
2 tsp baking powder
1/3 cup vegetable oil
1/3 cup milk
1 cup fresh blueberries
½ cup sugar
1/3 cup flour
¼ cup butter, cubed
1 ½ tsp ground cinnamon
Preheat oven to 400 degrees and grease muffin cups or line with muffin liners.
Combine 1 1/2 cups flour, 3/4 cup sugar, salt and baking powder. Put the vegetable oil into a 1 cup measuring cup and add the egg and enough milk to fill the cup. Mix this with flour mixture. Fold in blueberries. Fill muffin cups right to the top, and sprinkle with crumb topping mixture.
To Make Crumb Topping: Mix together 1/2 cup sugar, 1/3 cup flour, 1/4 cup butter, and 1 1/2 teaspoons cinnamon. Mix with fork, and sprinkle over muffins before baking.
Bake for 20 to 25 minutes, or until done.
These pictures are of the recipe my coworker made. She substituted the vegetable oil with olive oil. They were amazing!