2 Tablespoon All Purpose Gluten Free Flour
4 Tablespoon Butter, Unsalted
Cayenne Pepper
4 oz Grated Fontina Cheese
1 Finely Grated Garlic, Cloves
4 oz Grated Gruyere Cheese
2.5 Cups Whole Milk Milk, Whole
1/2 Teaspoon English Mustard Powder
1 Cup Gluten Free Panko Japanese Bread Crumbs
1/4 oz Grated Parmesan Cheese
Red Pepper Flakes
3/4 Teaspoon (divided) Salt
4 oz Grated Sharp White Cheddar Cheese
1/2 Small Sweet Onion
2 Teaspoon Thyme Leaves