Sift flour, baking powder, and salt together.
Cream butter thoroughly.
Add sugar gradually, creaming well after each addition.
Add eggs, one at a time, beating well after each.
Mix in cereal.
Combine milk and vanilla.
Add flour to egg mixture alternately with milk; stir just to moisten all flour.
Spoon batter into muffin pans which have been well greased on the bottoms only, filling 2/3 full.
Bake in hot oven (400° F.) about 15 minutes.