Pineapple Upside-down Cake

In an iron skillet, melt a stick of butter and crumble over the bottom a packed cup of brown sugar. Add cherries and pineapple. Mix a yellow cake mix. I like Pillsbury. Pour it into the skillet and bake. Let's eat. It's pretty made with pineapple rings if you are serving a few large portions. Use tidbits if serving many.