Fill a medium size sauce pot with water. Bring to a boil and add the squash. Boil for 2 or 3 minutes to partially cook the squash. Immediately shock the squash in ice water.
Meanwhile, melt the butter in a large sauté pan, add the onions and season with salt and pepper. Cook the onions until they achieve a caramel color. Remove from the heat and let cool.
Preheat oven to 350°F.
Paint the pizza crust with the pasta sauce. Layer the pizza crust with the garlic, bell peppers, squash and onions. Sprinkle the cheese over the pizza. If you are using a pre-cooked pizza dough, bake until warmed through and the cheese is melted. If you are using a fresh dough, cook 15 - 20 minutes or until desired crispness.
When full heated/cooked, cut fresh basil into ribbons and sprinkle over the pizza.
Makes 8 servings.