Melt 1 tablespoon butter in a 6" skillet over medium heat.
Add onion, red pepper, green pepper, and cook until tender. Add ham and cook 1 minute more.
Add remaining butter and stir. Pour whisked eggs into the pan and reduce heat to medium low.
Lift the edges of the egg, with a spatula or rubber scraper, to allow uncooked egg to run underneath.
Continue to cook until eggs are set. Top with cheese, remove from heat and cover 1 minute or until melted.
Fold in half and serve.
Notes
Use room-temperature eggs for best results.
Whisk eggs with a few drops of water. This will help them become extra fluffy and keep the other ingredients suspended.
Cook on medium or medium-low heat to ensure eggs do not scorch or overcook.
Refrigerate cooled Denver omelets in a covered container – stacked and separated with sheets of paper towels – for up to 2 days, or freeze for up to 3 months.
Thaw omelets in the refrigerator before reheating in the microwave or on the stovetop.