Hi guys! First time posting here :) I want to lighten up the yam casserole by adding butternut squash and making it fluffy. I don't want to use milk and I won't be adding any sugar to it either. I'm confident in the flavoring department but could use some help with ratios with the main components: squash/yams, eggs and butter. And also if you have a certain temp you'd recommend baking it at. Thanks much!!