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1
Preheat oven to 350 degrees F. Spray a baking dish with nonstick spray.
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2
Bring a large pot of salted water to a boil. Boil the pasta until al-dente. You want it to have a bit of bite because it will finish cooking in the oven. Drain well.
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3
While the pasta boils add 3 tablespoons butter to a medium skillet and melt. Add the garlic and saute 30 seconds then add in the lobster meat and saute for 3-5 minutes. Add the parsley and cook another 30 seconds. Remove the lobster from the pan.
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4
Add another 2 tablespoon of butter to the skillet. Throw in the crushed Ritz crackers and toss to coat. Toast the crumbs for 3-5 minutes, stirring frequently to avoid burning. Once the crumbs are lightly toasted, remove from the heat and set aside.
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5
In the same pot you boiled the pasta, melt the remaining 4 tablespoons butter over medium heat. Whisk in the flour. Reduce the heat to medium-low and let cook and bubble for 1 minute, stirring once or twice to avoid burning. Gradually whisk in the milk and raise the heat up to medium-high. Bring the mixture to a boil, whisking frequently until the sauce has thickened, about 2-3 minutes. Remove from the heat and stir in all of the cheese, mustard powder, cayenne, salt and pepper. Stir until the cheese is fully melted. Stir in the pasta and about 3/4 of the lobster meat. Transfer to the prepared baking dish.
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6
Evenly sprinkle on the remaining lobster chunks and then the toasted cracker crumbs. Place the baking dish on a baking sheet.
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7
Bake for 20 minutes or until the crumbs are golden brown and the sauce is bubbling.
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8
Remove from the oven and let sit five minutes