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Preheat oven to 375°. Butter a 9”-x-13” baking dish. In a large pot of salted, boiling water, cook macaroni until al dente. Drain and set aside. In a large saucepan, melt 1 stick butter. Sprinkle over flour and cook until slightly golden, 2 to 3 minutes. Pour in milk and whisk until combined. Season with mustard powder, salt, and pepper. Let simmer until starting to thicken, about 5 minutes. Remove pan from heat and whisk in cheddar, Gruyère, and 1 cup Parmesan. Continue whisking until melted and smooth. Stir in cooked macaroni and transfer to prepared baking dish. In a small bowl, combine remaining Parmesan with Panko and oil. Sprinkle mixture over macaroni, then season with more black pepper. Bake until bubbly and golden, 25 to 30 minutes. Garnish with parsley before serving. Let sit 10 minutes before serving.