
Heat the oven to 375°F and grease a 9-inch pie plate.
Melt the butter in a skillet over medium and cook the diced onion and small broccoli florets 5 minutes until bright green.
Whisk the eggs, milk, mustard, 3/4 tsp salt and pepper, then stir in the cheddar and the broccoli mixture.
Pour into the pie plate and bake 30-35 minutes until set in the center and golden on top. Rest 5 minutes.
Slice and serve with a green salad and tomatoes. Leftovers make a great lunch.
Photo: DinnerDrop