My daughter-in-law served this the other night and I immediately knew I had to snag the recipe

1/4 cup heavy cream
Heat oven to 350 degrees Fahrenheit and grease a 9-by-13-inch casserole dish.
Add all ingredients, except half of the cheese and half of the green onions, to a large bowl. Mix well and pour into the prepared casserole dish.
Cover the casserole dish with aluminum foil, and place in the oven.
Bake casserole for one hour.
Remove casserole from oven and remove aluminum foil.
Sprinkle casserole dish with remaining half of cheddar cheese and remaining half of green onions.
Place casserole back into the oven and bake for another 30 minutes, until cheese on top has melted and golden brown.