This combination of creamy peanut butter, caramelized cinnamon apples and crisp toast is pretty irresistible.
Preheat the oven to 350°F.
Halve the muffins and spread a heaping Tbsp of peanut butter on each half. Layer the apple slices on the peanut butter. Mix the sugar, cinnamon and nutmeg together in a small bowl and sprinkle about 2 tsp on top of each muffin half.
Put the muffin halves on a baking sheet and bake for 10 minutes. Set the oven to low broil and cook until bubbly and caramelized, about 3 minutes.