Step 1

Preheat oven to 350°F. Spray a nonstick muffin pan with olive oil spray.

Step 2

Heat the oil in a large non-stick skillet over medium heat.

Step 3

Sauté onions and salt for 5 minutes, until soft, add bell peppers, garlic, tomato, kielbasa sauté for another 5 to 7 minutes. Add spinach and cook until wilted, about 1 minute.  Set aside.

Step 4

Meanwhile, in a large bowl, whisk the eggs, egg whites, milk, flour, salt and pepper until smooth.

Step 5

Add the cheese and cooked kielbasa mixture to the bowl and mix well.

Step 6

Pour into the prepared muffin pan and bake for 28 to 30 minutes, or until firm.