Any fun recommendations of dishes to make with grand (4 years old).?

Yes pizza in the savory category.
But/and.
Make whatever the child likes for breakfast, lunch or dinner...e.g., custom scrambled eggs or omelet, bento box lunch, layered pancakes with meat, cheese or vegetable fillings.

Thanks so very much for the terrific ideas And for taking your time to share!

Mine used to love making pizza, both the usual tomato sauce sort and the dessert type. For the dessert type, I used sugar cookie dough that could be patted out in the pizza pan. While it baked, we'd mix up cream cheese with powdered sugar to spread on after it cooled. They could use plastic knives to cut soft fruits like strawberries, peeled kiwis, and bananas. They can even halve grapes if you like. Then it's just fun with assembly. Regular pizzas have to be baked- but they can do the assembly. You can also shape sweet or savory dough into various shapes, even roll and stuff them together. Depending on their dexterity, and your grater- they can grate cheese like cheddar to make pimento cheese. That makes a tasty filling for flat breads or tortillas, as well as other fillings, which can be rolled and cut with plastic knives for pinwheel sandwiches. And if you help handle the hand mixer, they can "assist" in mixing up cakes, muffins, cupcakes, and all sorts of things. They can roll out small amounts of dough or pie pastry, and make free form tarts- you just run the oven. Small children can also cut out cookies and decorate them- usually sprinkles are a big hit, and small fingers can place stuff easily. Mostly, have fun. You do the big knife work, the actually cooking, and the heavy stuff.

Sugar cookies cut out with cookie cutters. My kids love to cut them out. You will probably have to frost them yourself, or at least help with the frosting. I put a bunch of different sprinkles in small bowls and the kids decorate them. I use the bowls because they haven't figured out how to control how much gets poured out of the jars the sprinkles come in.