I baked this cake in a 4 quart round slow cooker so that I could have a cake that looks like it was baked in the oven in a traditional cake pan. However you can use a 4.5 quart round slow cooker or a 5 quart round slow cooker with great results. If you would like to bake this cake in a larger slow cooker (like 6 quart or larger) you may either need to watch your baking time as your cake will be thinner or double the recipe. You can of course use an oval shaped slow cooker too, your finished baked cake will be oval in shape but will still taste great!