Place broccoli into sprayed casserole dish and microwave for 3 minutes on high. Drain if necessary and turn out onto cutting board. Chop broccoli into smaller pieces.

Place butter in same casserole dish and microwave on high for 1-1 1/2 minutes to melt.

Stir soup into melted butter. Fill soup can about 1/4 of the way with cream or milk and add to condensed soup in dish.

Break egg into soup can and beat with the spoon you’ve been using, then stir the egg into soup mixture.

Add 1/2 of cheese to sauce in dish, then mix in chopped broccoli. Season with pepper. Sprinkle remaining cheese on top. Cover and refrigerate at this point up to 24 hours before baking if desired.

Bake at 350 for 30-45 minutes, until heated through and bubbling. Top with onions and return to oven for 2-3 minutes to heat onions.