Preheat oven to 375°F. Spray a 12 cup muffin pan plus 4 cups of additional pan with baking spray. Alternately, line with cupcake liners lightly spritzed with cooking spray. Set aside.
In a separate bowl mix together diced apple and granulated sugar. Set aside while you prepare the remaining ingredients.
Sift together flour, baking powder, apple pie spice, baking soda and salt. (A whisk works perfectly for this step)
Whisk together buttermilk, melted butter, eggs, brown sugar and vanilla in a separate bowl.
Mix apples into dry ingredients. Add wet ingredients, mix well.
Divide batter between muffin cups. Sprinkle tops with pecans and toffee bits.
Bake for 18-22 minutes or until a toothpick inserted into the center comes back clean. Store chilled in an airtight container.