Just chop up a bunch of veggies (assorted or not). I like carrots, squash, onions, garlic, tomatoes, etc. Preheat the oven to 400 degrees (or less), put some olive oil on a cookie sheet (couple of tablespoons-ish). Put the cookie sheet with oil in the oven for just a few minutes. Take it out and then put the veggies on the cookie sheet and cook for about 20 minutes or more....until the veggies are to your liking. Stir mid-way. If you add tomatoes or spinach, just add those for the the last 5-10 minutes or so. If you add the tomatoes too early, the whole thing will be too watery.
Serve over pasta or rice or as a side. Or, just eat it as is and couple it with some hearty bread. (I added some apple-sage grain "sausage" to mine, and it was delicious!)