Here are things my LO likes...
Cheese or Black Bean and Cheese Quesadilla on (smaller sized) whole wheat tortilla. I mash the black beans with a fork onto a tortilla (only onto half), cover the beans with a little mild cheddar cheese, fold the tortilla, microwave for about 30seconds, cut into little squares.
Yobaby yogurt
Any kind of fruit
Frozen veggies - I buy the bags of mixed veggies, there are lots of varieties. I put some in a child-sized bowl, add about 1/2in of water, microwave until warm.
Shredded cheese
Peanut butter on crackers (if he's not allergic, of course)
Frozen waffles or pancakes
Scrambled eggs
Canned Veggies
I'm sure there are more, but that's all I can think of at the moment. Sometimes I'll give leftovers from the last night's dinner.
Good luck!