To prepare apple muffins, first gather all the ingredients: flour, sugar, baking powder, salt, eggs, milk, oil, vanilla extract, and apples.
Secondly, mix the dry ingredients in one bowl, whisk the wet ingredients in another, then combine the two mixtures together. Fold in diced apples.
Finally, spoon the batter into muffin tins, bake in a preheated oven at 180°C (350°F) for about 20-25 minutes, or until a toothpick inserted comes out clean. Enjoy your delicious apple muffins!