Fancy Mac and Cheese

INGREDIENTS

• 16 ounces, weight White Button Or Cremini Mushrooms, Quartered
• Olive Oil, For Drizzling
• Kosher Salt And Black Pepper To Taste
• 8 slices Thick Cut Bacon
• 2 whole Yellow Onions, Peeled, Halved, And Thinly Sliced
• 5 Tablespoons Butter, Plus More For Buttering The Pan
• 1/2 cup Grated Parmesan Cheese
• 1/2 cup Grated Gruyere Cheese
• 1/2 cup Grated Fontina Cheese
• 4 ounces, weight Goat Cheese (chevre)
• 1-1/2 pound Macaroni
• 1/4 cup All-purpose Flour
• 2 cups Whole Milk
• 1/2 cup Half-and-half
• 2 whole Eggs, Beaten
• 4 ounces, weight Crumbled Gorgonzola Or Other Blue Cheese