Apple Streusel Muffins
["1 pkg. apple cinnamon muffin mix", "1 tart apple, peeled and diced", "1/3 c. chopped walnuts", "3 Tbsp. brown sugar", "4 1/2 tsp. flour", "1 Tbsp. butter"]
["Prepare muffin mix according to package directions; fold in apple. Fill greased muffin cups 3/4 full. In a small bowl, combine the walnuts, flour, brown sugar and butter; sprinkle over batter."]
["apple cinnamon", "apple", "walnuts", "brown sugar", "flour", "butter"]