HEAT oven to 400 F. Grease or line 12 (2 -inch) muffin cups with paper baking cups.
COMBINE flour, sugar, baking powder, cinnamon and salt, mix well.
COMBINE butter, milk, egg, vanilla and apple.
ADD to flour mixture; stir just until dry ingredients are moistened.
FOLD in raisins.
SPOON batter into prepared muffin cups.
BAKE at 400 F in upper third of oven for 20 to 25 minutes or until toothpick inserted in center comes out clean.
VARIATION: Substitute grated carrot or zucchini for chopped apple.