Mac N Cheese Grilled Cheese Recipe: Double Cheese Decadence on Toasted Bread

This recipe takes comfort food to the next level by combining two classics into one decadent dish. The creamy mac and cheese becomes the filling for a golden grilled sandwich.

I developed this fusion after years of perfecting both dishes separately. The result is a crispy, cheesy masterpiece that satisfies every carb craving.

Ingredients for Mac N Cheese Grilled Cheese

Decadent ingredients transform two comfort classics into one unforgettable dish ready in minutes.

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The cheese selection elevates this dish. Cabot or Tillamook sharp cheddar delivers the best melt and flavor. Gruyere adds nutty depth—find it pre-sliced at Whole Foods or Trader Joe’s for convenience. Always grate your own; pre-shredded contains anti-caking agents that prevent smooth melting. The butter should be European-style for richer flavor in both the mac and the grilling process.

No Gruyere? Fontina or Monterey Jack substitute beautifully. For a tangier profile, Pepper Jack at half the quantity works. Sourdough not available? Brioche or Texas toast offer similar sturdiness. Whole milk can be swapped with 2% in a pinch, but avoid skim as it lacks the fat needed for creamy texture. The Dijon adds essential acidity—yellow mustard works if that’s all you have.

The mac and cheese base keeps 3-4 days refrigerated in an airtight container. Assemble and grill sandwiches just before serving for optimal crispness. Freeze cooked mac for up to 2 months—thaw completely before using as filling. Always bring cheese to room temperature before grating for easiest prep.

Step-by-Step Instructions for Mac N Cheese Grilled Cheese

This method ensures perfectly creamy mac and cheese paired with crisp, golden grilled cheese sandwiches.

Step 1: Cook and Drain the Elbow Macaroni

Bring a large pot of salted water to a rolling boil. Add the 8 oz Elbow Macaroni and cook according to package directions until al dente. Stir occasionally to prevent sticking.

Drain the macaroni in a colander and immediately rinse under cold water to stop the cooking process. This prevents overcooking when combined with the hot cheese sauce later. Shake off excess water and set aside.

Step 2: Prepare the Cheese Sauce

In a large saucepan, melt ¼ cup of the unsalted butter over medium heat. Add the 0.25 cup All-Purpose Flour and whisk constantly for 1-2 minutes to form a smooth roux. The mixture should turn a light golden color but not brown.

Gradually pour in the 2 cups Whole Milk, whisking continuously to avoid lumps. Cook for 3-5 minutes, stirring often, until the sauce thickens enough to coat the back of a spoon. Stir in the 1 tbsp Dijon Mustard, 1 tsp Salt, 0.5 tsp Black Pepper, and 0.25 tsp Dried Thyme.

Reduce heat to low and add the 2 cups Sharp Cheddar Cheese, 1 cup Gruyere Cheese, and 0.5 cup Parmesan Cheese. Stir until all cheeses are fully melted and the sauce is smooth. Taste and adjust seasoning if needed.

Step 3: Combine Macaroni and Cheese Sauce

Add the cooked and drained 8 oz Elbow Macaroni to the cheese sauce. Stir gently until every piece is evenly coated. The sauce should cling to the pasta without pooling at the bottom of the pan.

If the mixture seems too thick, stir in a splash of warm milk to reach your desired consistency. Cover and set aside while you prepare the grilled cheese sandwiches.

Step 4: Assemble and Cook the Grilled Cheese Sandwiches

Butter one side of each of the 8 slices Sourdough Bread with the remaining ¼ cup unsalted butter. Sprinkle the unbuttered sides lightly with 0.5 tsp Garlic Powder.

Heat a large skillet or griddle over medium heat. Place 4 slices of bread, buttered side down, in the pan. Spoon a generous portion of the mac and cheese onto each slice, dividing it evenly. Top with the remaining 4 slices, buttered side up.

Cook for 3-4 minutes per side until the bread is golden brown and the cheese inside is fully melted. Press down gently with a spatula to ensure even contact with the pan. Serve immediately while hot and melty.

Make-Ahead Tips for Leftovers

Prep Ahead Strategy

I always cook the elbow macaroni and make the cheese sauce 1 day ahead. Store them separately in airtight containers in the fridge. This lets the flavors meld beautifully overnight.

Same-Day Assembly

On serving day, reheat the sauce gently over low heat, adding a splash of milk if it thickens too much. Combine with pasta, then assemble sandwiches. This method keeps the filling creamy without overcooking. 💡

Freezer-Friendly Base

The cooked mac and cheese freezes well for up to 2 months. Portion into sandwich-sized amounts in freezer bags, flatten to save space, and thaw completely in the fridge before using as filling.

Bread Prep Tip

Butter and season your sourdough slices right before grilling. If prepping ahead, store unbuttered bread at room temperature in a paper bag to maintain freshness without drying out.

Time-Saving Hack

Make a double batch of the cheese sauce and freeze half for next time. I use silicone muffin molds for perfect ½ cup portions. Just pop out what you need when ready to assemble. ⏰

Crispiness Guarantee

For the crispiest sandwiches, assemble and grill just before serving. If you must hold them, keep in a 200°F oven on a wire rack for up to 15 minutes to prevent sogginess.