Apple Pie Filling: Cook apples, sugar, spices, flour, and lemon juice until softened. Stir in butter (optional).
Crumble: Mix flour and sugar, rub in butter until crumbly.
Muffin Batter: Combine dry ingredients, add chopped apple. Stir in wet ingredients. Chill 20 minutes.
Assemble: Preheat oven to 180°C (350°F). Fill muffin cups ¾ full, add apple filling, top with crumble.
Bake: 20-25 minutes, cool on a rack. Enjoy!
