Heat oven to 375 F.
Slice tomatoes. Slice onions and garlic, if desired. Place in baking dish.
Sprinkle garlic powder, onion powder, sugar and mesquite seasoning over tomatoes. Drizzle avocado oil over top and mix well.
Bake about 1 hour. Blend until smooth.
Pour into pot and mix in broth and whipping cream. Bring to simmer and add salt and pepper, to taste.
Serve with grilled cheese sandwiches!