I found a few recipes on the net and came up with this combination. I was a bit laissez-faire on the amounts of ingredients so tweak it as you will. My recipe makes about 8 cups of soup.
4 large red peppers, halved and seeded
1/2-1 onion, cut in chunks (I don't put this in but you can)
1/2 head garlic (or more)
1 medium sweet potato, cooked into microwave, cut in large chunks, peeled
Italian seasoning (ie basil, thyme, oregano)
6 cups of chicken stock
Plain yogurt (or cream)
Lay red peppers, skin side up on baking sheet and brush with oil. Toss other veggies in a little oil and lay around the peppers. Brush the garlic with oil and wrap in foil. place in oven with other veggies.
Place in middle of oven under broiler set at about 400-450. Check frequently. 15-20 minutes.
When I got to this point, the peppers seem like they need longer cooking so I switch the oven to 400 bake instead of broil and cook for another 10 minutes or so, until the peppers were soft and the skins were starting to blacken.
Remove from tray, and cool. Slip peels off tomatoes and garlic. Sweat peppers in a bag 10 minutes and then peel.
Put veggies in large pot and add 6 cups of chicken broth and seasonings. Bring to a gentle boil. Puree with hand blender. Cook for 15-20 minutes. Add thyme, basil, salt and pepper to taste.
Serve with a little cream or a dollop of plain yogurt. A dash of Franks Red Hot Chili Lime is tasty too.
I store in 1 cup containers all week in the fridge and add yogurt after I heat it up.