1/2 cup firmly packed brown sugar
1/3 cup all purpose flour
1/4 cup unsalted butter, melted
1 tsp cinnamon
1 1/2 cups firmly packed brown sugar
2/3 cup vegetable oil
1 1/2 tsp vanilla
2 1/2 cups all purpose flour
1 tsp baking soda
1/4 tsp salt
1 cup buttermilk
2 cups diced peeled firm tart apples (like Granny Smith)
Topping: In a small bowl toss together brown sugar, flour, butter and cinnamon until crumbly; set aside.
Muffins: In a large bowl whisk together brown sugar, oil, egg 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 degrees for 25-30 minutes or until golden brown and tops spring back.