Apple Pie Muffins

Apple Pie Muffins (Adapted from Food.com)
Crumb Topping:
1/2 cup  firmly packed  brown sugar
1/3 cup all-purpose flour
1/4 cup unsalted butter, softened
1 teaspoon cinnamon
Muffins:
1 1/2 cups firmly packed brown sugar
2/3 cup canola oil
1 egg
1 1/2 teaspoons vanilla
1 teaspoon cinnamon
2 1/2 cups all-purpose flour
1 teaspoon baking soda
1/4 teaspoon salt
1 cup buttermilk (I used 1 cup of regular milk and then added 2 tsp. white vinegar to sour it)
3 cups diced peeled firm tart apples
Topping: In a small bowl toss together sugar, flour, butter and cinnamon until crumbly; set aside. Muffins: In a large bowl whisk together brown sugar, oil, egg, cinnamon, and vanilla until smooth. In a separate bowl, sift together flour, soda and salt. Stir oil mixture into flour mixture alternately with buttermilk. Fold in apples, mixing just until combined. Spoon into greased muffin cups filling 3/4 full.
Sprinkle topping over evenly.  Bake at 350°F for 25-30 minutes (mine took about 27 minutes)  or until golden brown and tops spring back.

From http://momadvice.com/blog/2010/09/apple-pie-muffins-2

**These are delicious! A little time consuming but worth it.