You’ll need jumbo muffin tins to bake mini pineapple upside-down cake.  If you don’t have jumbo muffin tins, you can use regular muffin tins and follow one of these hacks: 1. I used regular muffin tins to make this mini pineapple upside-down cake. To make pineapple rings fit at the bottom on regular muffin tins, simply cut pineapple rings into smaller rings using donut cutter. The size of donut cutter you have matters. The one I have results in smaller pineapple rings that fit perfectly in regular muffin tins. 2. Use regular muffin tins and simply use crushed pineapple instead of rings. Look for crushed canned pineapple instead of pineapple rings.