Lightly spoon flours into dry measuring cups; level with a knife.
Combine flours, sugars, baking powder, and salt in a large bowl; stir with a whisk. Make a well in center of mixture.
Combine milk and next 4 ingredients (through vanilla); add to flour mixture, stirring just until moist.
Spoon batter into 12 muffin cups coated with cooking spray. Fill each cup half full with batter. Spoon 1 teaspoon jam into each cup. Spoon remaining batter on top to cover jam.
Bake at 400 for 20 minutes or until muffins spring back when touched lightly in center.