1In 10-inch ovenproof skillet, heat 1 teaspoon butter and the oil over medium heat until butter is melted. Cook onions in butter mixture 20 minutes, stirring frequently, until soft. Add pancetta; cook until crisp. Drain all but 1 tablespoon drippings from skillet; add 2 tablespoons butter to skillet.
2In medium bowl, beat eggs, milk, salt and pepper with fork or wire whisk until well mixed; pour over pancetta mixture in hot skillet. Sprinkle 1/2 cup goat cheese over egg mixture. As mixture begins to set at bottom and side, gently lift cooked portions with spatula so that thin, uncooked portion can flow to bottom. Avoid constant stirring. Cook 3 minutes or until eggs are thickened but still moist; remove from heat. Sprinkle remaining goat cheese and the Parmesan cheese over top of egg mixture.
3Set oven control to broil. Broil with top of skillet 6 inches from heat 1 to 2 minutes or until eggs are set and top is just beginning to brown. To serve, cut into 8 wedges.