Preheat oven to 400℉
Boil some salted water and cook your elbow noodles based on the package instructions. Make sure that you don't overcook your noodles!
Season your shrimp with ½ tsp of creole seasoning, old bay, and garlic powder. You also want to season them with ¼ tsp of paprika and black pepper. Mix well to spread the seasoning across the shirmp.
In a separate pot, cook down the minced garlic in some butter. Once the garlic is fragrant, add the shrimp to the pot. Remove the cooked shrimp before going to the next step.
In the same pot, pour in your heavy cream and bring it to a simmer on medium heat.
Once the heavy cream is simmering, add in the sharp cheddar and Monterey jack cheese and stir until everything is melted smoothly. Don't forget to season your cheese sauce with the remaining seasonings.
Take your cooked elbow noodles and add them to a baking pan or a cast iron skillet. Cover your cooked noodles with the cream cheese, making sure it is spread throughout the noodles evenly.
Take ¾ of your cooked shrimp and chop them up into small pieces.
Incorporate the chopped shrimp and lump crab meat into the noodles and cream cheese before pouring on your cheese sauce and stirring thoroughly.
Top everything with the leftover cooked shrimp and sprinkle on some more cheese to cover the top.
Put the mac and cheese into the oven for 10-15 minutes or until the top gets a nice golden-brown crust.
Enjoy!