Hiding Vegetables in Pasta Sauce

I can't get Barrett to eat any vegetables in their original form. Last night I decided I would try making a sauce out of them since he loves to eat rice noodles. I just feel like eating nothing but Rice Chex, rice and rice noodles isn't considered a balanced diet. I was trying to get him to eat some left over green beans and he would just split them in half and eat the seeds. So I blended them up and mixed them into his rice. It worked just fine, so for dinner I decided to make a vegetable puree pasta sauce to keep his noodles from being too bland and to add a bit of nutrients to his meal. He really liked it and is eating some at the moment. Here's the recipe:

10 green beans
5 baby carrots microwaved until soft
A few slices of onion
a dash of garlic powder
A handful of fresh spinach, microwaved until limp
water

I just blended them in a blender until they were the consistency of a nice red sauce and mixed them in his noodles. It was enough to fill a cereal bowl completely full with noodles and sauce. I liked the sauce enough that I might make some for myself too!