In a medium bowl, mix flour, baking powder, baking soda and salt.
In a large bowl, beat together butter, sugar and eggs until smooth. Mix in vanilla.
Stir in apples, and gradually blend in flour mixture. Spoon mixture into prepared muffin pan.
In small bowl, mix brown sugar, flour and cinnamon. Cut in butter until mixture is like coarse crumbs. Sprinkle over tops of mixture in muffin pan.
Bake 20 min, or until toothpick inserted in the center of a muffin comes out clean. Allow to sit 5 minutes before removing muffins from pan. Cool on wire rack.
Nutrition Info Per Serving (1 muffin): Calories 252.1 Total Fat 9.5 g Saturated Fat 5.7 g Polyunsaturated Fat 0.5 g Monounsaturated Fat 2.6 g Cholesterol 54.2 mg Sodium 265.6 mg Potassium 80.4 mg Total Carbohydrate 42.0 g Dietary Fiber 1.1 g Sugars 22.6 g Protein 3.2 g