I NEED IMMEDIATE ADVICE QUICK 10?

I had this kebab recipe but then I realized I didn't have any skewers so I just put this mixture of bell peppers, onions, zuicchini, and mushrooms. I put minced garlic cloves and olive oil and teriyaki sauce mixed into it into a casserole dish and put it in the oven at 350 degrees F like it told me to but idk how long to bake it for! HELP.