INGREDIENTS
1/2 lb
thinly sliced cooked roast beef, cut in strips
1
medium onion, sliced
8 oz
sliced mushrooms (optional)
2 tbsp
olive oil
1 tsp
garlic powder
salt
pepper
8 oz
(dry) spaghetti
Cheese Sauce:
2 tbsp
butter
1 1/2 tbsp
flour
1 cup
whole milk or half-and-half
1 cup
shredded cheddar cheese
salt
pepper