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Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish.

In a large pot or Dutch oven, melt the unsalted butter over medium heat. Add the all-purpose flour and whisk continuously for 2-3 minutes to create a light brown roux.

Stir in the black pepper, salt, garlic powder, and paprika into the roux. Cook for an additional 1 minute, stirring constantly.

Gradually whisk in the warmed whole milk, about 1/2 cup at a time, ensuring no lumps form. Continue whisking until the sauce is smooth and thickened, coating the back of a spoon.

Remove the pot from the heat. Stir in the 2 cups of shredded sharp cheddar cheese and 1 cup of shredded Monterey Jack cheese until fully melted and smooth. Taste and adjust seasonings if necessary.

Add the cooked spaghetti noodles to the prepared baking dish. Pour the cheese sauce generously over the spaghetti. Use a wooden spoon to gently toss and ensure all spaghetti strands are thoroughly coated with the sauce.

Evenly sprinkle the remaining 1 cup of shredded sharp cheddar cheese over the top of the spaghetti.

Bake for 25-30 minutes, or until the cheese topping is melted, bubbly, and golden brown.

Remove from oven and let stand for 5 minutes before slicing and serving.


Preheat oven to 375°F. Lightly grease a 9x13 inch baking dish.

In a large pot or Dutch oven, melt the unsalted butter over medium heat. Add the all-purpose flour and whisk continuously for 2-3 minutes to create a light brown roux.

Stir in the black pepper, salt, garlic powder, and paprika into the roux. Cook for an additional 1 minute, stirring constantly.

Gradually whisk in the warmed whole milk, about 1/2 cup at a time, ensuring no lumps form. Continue whisking until the sauce is smooth and thickened, coating the back of a spoon.

Remove the pot from the heat. Stir in the 2 cups of shredded sharp cheddar cheese and 1 cup of shredded Monterey Jack cheese until fully melted and smooth. Taste and adjust seasonings if necessary.

Add the cooked spaghetti noodles to the prepared baking dish. Pour the cheese sauce generously over the spaghetti. Use a wooden spoon to gently toss and ensure all spaghetti strands are thoroughly coated with the sauce.

Evenly sprinkle the remaining 1 cup of shredded sharp cheddar cheese over the top of the spaghetti.

Bake for 25-30 minutes, or until the cheese topping is melted, bubbly, and golden brown.

Remove from oven and let stand for 5 minutes before slicing and serving.
