Preparation Whisk eggs, chives, salt, and pepper in medium bowl to blend. Melt butter in large broilerproof skillet over medium heat. Add peppers and ham; sauté until peppers are tender, about 5 minutes. Preheat broiler. Pour egg mixture over peppers and ham in skillet. Cook over medium heat until bottom and edges are set, stirring occasionally, about 3 minutes. Using spatula, carefully lift edges to allow uncooked egg to flow underneath. Reduce heat to medium-low. Lift edges 2 or 3 more times, allowing uncooked egg to flow underneath, until top is almost set, about 2 minutes. Sprinkle cheese over frittata. Transfer skillet to broiler. Broil until cheese is bubbling and eggs are set, about 1 minute. Let frittata stand at least 1 minute and up to 1 hour. Rewarm in microwave oven, if desired, or serve at room temperature.
Preparation Whisk eggs, chives, salt, and pepper in medium bowl to blend. Melt butter in large broilerproof skillet over medium heat. Add peppers and ham; sauté until peppers are tender, about 5 minutes. Preheat broiler. Pour egg mixture over peppers and ham in skillet. Cook over medium heat until bottom and edges are set, stirring occasionally, about 3 minutes. Using spatula, carefully lift edges to allow uncooked egg to flow underneath. Reduce heat to medium-low. Lift edges 2 or 3 more times, allowing uncooked egg to flow underneath, until top is almost set, about 2 minutes. Sprinkle cheese over frittata. Transfer skillet to broiler. Broil until cheese is bubbling and eggs are set, about 1 minute. Let frittata stand at least 1 minute and up to 1 hour. Rewarm in microwave oven, if desired, or serve at room temperature.