Generously spray a large nonstick skillet with olive oil cooking spray and heat over medium-high heat.
Sauté the onion and garlic until golden, about 2 minutes.
Add the potatoes, green pepper, tomato, and seasonings.
Cook until tender, stirring frequently, about 5 to 6 minutes.
Transfer potato mixture to a plate.
Clean and dry the skillet.
Spray again with olive oil cooking spray and place over medium-high heat.
Allow the pan to get hot, then pour the egg substitute into the pan.
Using a rubber spatula, fold the egg from the outside into the center until the eggs are almost set.
Add the potato mixture on top; allow all to heat through, keeping the omelet loose from the pan with the spatula.
Remove from the stove.
Cut into quarters and serve.
