Heat oil in large nonstick skillet over medium-high heat until hot. Add potatoes; cook, covered, stirring occasionally, until golden, 6 to 8 minutes. Add sausage, mushrooms, if desired, and peppers; cook, uncovered, stirring occasionally, until vegetables are tender, about 4 minutes.
Reduce heat to medium. Pour eggs over mixture in skillet. As eggs begin to set, gently pull the eggs across the pan with an inverted turner. Continue cooking until eggs are thickened and no visible liquid egg remains. Do not stir constantly.
A hearty sausage and egg skillet, filling enough for breakfast, lunch or dinner.
Avoid cast iron. Eggs scrambled in a cast iron skillet can turn a greenish shade. This harmless but unappealing color change is the result of a chemical reaction between iron in the pan and sulfur in egg whites.
Don’t overcook. The heat retained in the pan will continue to cook and firm up the eggs after pan is removed from heat.
How long to beat? It’s a matter of preference. Light beating produces more dense scrambled eggs. Vigorous beating aerates the eggs, resulting in lighter fluffier curds.