Summer Minestrone Soup

Name: Summer Minestrone Soup
Ingredients: 3 tablespoons unsalted butter; 1 white onion, chopped; 3 cloves garlic, minced; 3 carrots, peeled and chopped; 1 yellow squash, sliced; 1 zucchini, sliced; Dried oregano; Chopped fresh basil; Salt; Pepper; 6 cups chicken stock, heated; 8 ounces pasta shells; 2 tomatoes, diced; 1 head broccoli, in florets