Can you use a casserole dish instead of a pan to back Blondie's?

Yes, you can use a casserole dish instead of a pan to bake Blondies. Just ensure the casserole dish is the appropriate size, as this may affect baking time. Keep an eye on the Blondies while they bake, as thicker or larger dishes may require additional time for even cooking. Adjust the baking time accordingly and test for doneness with a toothpick.