Start by preheating your oven to 350°F (175°C) to ensure the muffins bake evenly and rise perfectly.
Peel and dice your apples, then mix them with cinnamon and a touch of sugar to create a deliciously spiced filling.
Combine flour, baking powder, sugar, eggs, milk, and melted butter to create a smooth muffin batter.
Gently fold the apple mixture into the muffin batter, ensuring the apples are evenly distributed.
Mix butter, flour, and sugar to create a crumbly topping, which will add a crunchy texture to the muffins.
Spoon the muffin batter into a lined or greased muffin tin, filling each cup about 2/3 full, and top with the crumble mixture.
Bake the muffins for about 20-25 minutes or until they’re golden brown and a toothpick comes out clean.