Scalloped Potatoes

Name: Scalloped Potatoes
Cuisine: American
Ingredients: 6 Yukon Potatoes; 1 cup beer; 2 cups milk; 4 cloves garlic (or half tsp powder); 1/4 tsp onion powder (or one whole onion); 1/4 tsp cayenne; 1/4 tsp red chili pepper flakes; 1/4 tsp thyme; 1/8 tsp smoked paprika; 1/4 tsp pepper; 1/2 tsp salt; 1 1/2 cup pepper Jack cheese (jalapeño); 1 cup cheddar cheese; 1/3 cup flour; Handful parsley (garnish); 16oz mushrooms; 1/4 cup butter; 1/4 cup olive oil