1 lb (450g) ground beef
1 tsp garlic powder
1 tsp onion powder
1 tsp salt
1/2 tsp black pepper
1/2 tsp dried thyme
2 tbsp olive oil
1 cup sliced mushrooms
2 tbsp all-purpose flour
1 1/2 cups milk
4 medium potatoes, thinly sliced
1 large onion, thinly sliced
1 cup shredded cheddar cheese
