Zesty Hot Squash with Grilled Onions and Tomatoes

3 medium small yellow squash, cubed
3 small zucchini, cubed
1 (10 ounce) can diced tomatoes with green chile peppers
1/2 onion, chopped
salt to taste
garlic powder to taste
Directions

In a large saucepan, combine squash, zucchini, tomatoes with chiles, onion, salt and garlic powder. Bring to a boil over medium-high heat.
Reduce heat to low and cook until tender-crisp.