3 lbs. frozen broccoli, 1 floret, 2 cut
4 tbsp. salted butter
2 tbsp. olive oil
4 large button mushrooms, sliced thinly
1 small onion, small diced
1/4 c. all purpose flour
1 can evaporated milk
1 to 1 1/2 c. low sodium chicken broth or steaming water
2 1/2 c. shredded cheddar cheese, mild
1 c. shredded mozzarella cheese
1/4 c. grated Pecorino Romano
1 tbsp. onion powder
2 tsp. ground mustard
scant grating of fresh nutmeg
2 eggs
1/2 c. mayonnaise
Kosher salt and fresh cracked black pepper
For Topping:
1 1/2 c. fresh french bread crumbled
2 tbsp. butter
1 tbsp. olive oil