Delicious Muffins!

This morning I was hungry for muffins but was out of the Jiffy mixes that I normally just whip up really quickly. I only had one egg and not much milk left. I got onto Pinterest and typed in "easy muffin recipes". I found one that looked delicious and had everything except blueberries so I grated up a granny smith apple and substituted that instead.

Ingredients:
1 1/2 cups all-purpose flour
3/4 cup white sugar
1/2 teaspoon salt
2 teaspoons baking powder
1/3 cup vegetable oil
1 egg
1/3 cup milk
1 cup fresh blueberries
1/2 cup white sugar
1/3 cup all-purpose flour
1/4 cup butter, cubed (mine came out of the freezer so I used softened butter and it worked out)
1 1/2 teaspoons ground cinnamon
 Directions:

1. Preheat oven to 400 degrees F (200 degrees C). Grease muffin cups or line with muffin liners.
2. Combine 1 1/2 cups flour, 3/4 cup sugar, salt and baking powder. Place vegetable oil into a 1 cup measuring cup; 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.
3. 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.
4. Bake for 20 to 25 minutes in the preheated oven, or until done.