Broccoi, Cheddar and Ham Strata

recipe courtesy familycircle.com

1 TBSP olive oil
1 medium sweet onion, diced
1 lb frozen chopped broccoli, thawed
1 loaf Italian bread (14 oz), cut into cubes
1/2 lb sliced deli ham, chopped
6 large eggs
1 1/2 c milk
2 TBSP chives
1 TBSP dijon mustard
1/2 tsp salt
1/4 tsp pepper
1 1/2 c shredded cheddar

Heat oven to 375. Coat a 2 quart oval baking dish with cooking spray. Heat oil in a large skillet over medium heat. Add onion and cook for 5 minutes. Add broccoli and cook another 3 minutes. Place bread cubes in a large bowl. Stir in broccoli mixture and the ham.
In a medium bowl, whisk together the eggs, milk, chives, mustard, salt and pepper. Pour over bread mixture, stirring to mix. Transfer to baking dish, top evenly with cheese.
Bake for 40-45 minutes