Step 1

Warm a large skillet over medium heat.  Add the olive oil and butter. Once the butter is melted, add the chopped onions and sauté until crisp tender and starting to brown, about 5 minutes.

Step 2

Add the squash, zucchini, tomatoes with juice, pepper, salt and Mrs. Dash.

Step 3

Heat until boiling. Cover and cook over medium-low until the squash is crisp tender but not falling apart. Remove the lid and boil until some of the liquid is evaporated.

Step 4

If freezing for later use, cook only a few minutes to mix all ingredients, cool and freeze.