Two Healthy Kitchens
Cut the sausages into 1/4"-thick rounds, and then cut the rounds into quarters. You should have about 1 cup of sausage pieces.
The squash should be in roughly 1/2" cubes. If the brand you buy has larger chunks, allow the squash to thaw just enough so that you can cut it, and then cut it into 1/2" cubes.
Coat a large, nonstick skillet with cooking spray. Over medium heat, cook sausage, butternut squash, onion, and red pepper until onion is beginning to soften, and the sausage.