In a mixing bowl, cream butter and sugar. Add eggs, one at a time, beating well after each addition, then add vanilla.
Combine the flour, baking powder, baking soda, cinnamon, poppy seeds and salt; stir into creamed mixture, alternating with sour cream until just moistened.
Fold in strawberries. Fill greased or paper-lined muffin cups until two-thirds full.
Bake at 400 F for 20-25 minutes or until just done in the middle.
Cool for 5 minutes before removing from pans to wire racks.
Enjoy!