Preheat your oven to 350 degrees F.
Start by cooking your lobster tail by broiling it in the oven, or boiling it in a pot of salted water. Once it is cooked, give the lobster meat a rough chop and set it to the side.
Next, cook your pasta by adding your elbow macaroni to a large pot of boiling water. Cook it until the pasta is al dente, for about 10 minutes. Drain the water and set the pasta to the side.
Start making your cheese sauce by melting the butter in a large pot over medium heat. Sprinkle in the flour and stir it around until the flour completely absorbs the butter.
Now pour in your heavy cream and whisk it around until the roux is smooth and blended in with the cream. Gently pour in your remaining milk.
Sprinkle in half of all of your cheeses. Stir the cheese mixture until the cheese is completely melted. Stir the mixture constantly so that it does not burn.
Season the cheese sauce with all of the seasonings including the seasoned salt, old bay seasoning, pepper, garlic powder and onion powder. Stir it until fully combined, then remove the sauce from the heat.
Spray a 9x13 baking dish with non-stick spray. Add your pasta into the baking dish and pour your cheese sauce directly over the top. Stir it around until all of the noodles are coated.
Gently fold in your lobster meat so that it is well combined. Sprinkle the remaining cheese right over the top of the mac and cheese.
OPTIONAL: sprinkle the top with chopped parsley and a little paprika.
Place the dish in the oven and bake for about 20 minutes or until the top is golden brown. Let the dish sit for at least 5-7 minutes before serving.