Jam muffins

2 cups all-purpose flour OR 1 cup all-purpose flour and 1 cup whole wheat flour
1/2 cup white sugar
3 teaspoons baking powder
1/2 teaspoon salt
3/4 cup milk
1/3 cup vegetable oil
1 egg
2 tablespoons any flavor fruit jam
1/4 cup chopped walnuts (optional)

DIRECTIONS
Heat oven to 400 degrees. Grease bottoms only of 12 muffin cups or line with baking cups.
In a medium bowl, combine flour, sugar, baking powder and salt; mix well. In a small bowl, combine milk, oil and egg; blend well. Add dry ingredients all at once; stir just until dry ingredients are moistened (batter will be lumpy.)
Fill cups 2/3 full. Place 1/2 teaspoon any flavor jam on each muffin before baking; press into batter. If desired, sprinkle with finely chopped nuts.
Bake for 20 to 25 minutes or until toothpick inserted in center comes out clean. Cool 1 minute before removing from pan. Serve warm.