I also tried The Sneaky Chef's Mega Marinara Sauce and it was a huge hit. We all loved it and aside from going with just spaghetti and meatballs, it goes on the Everybody Loves Romano Chicken (one of our all-time favorites!) and the Charmin' Chicken Parm (not so great).
Please see the link above for some delicious cupcakes with sneaky ingredients. The kids kept asking for these all day long. Who would guess they had a generous portion of spinach inside?