Prepare the oven. Preheat it to 375 degrees.
Using cooking spray, grease a 2-quart baking dish. Or use butter to lightly coat the dish.
Following the package directions, cook the pasta until al dente.
While the pasta is cooking, add 6 tablespoons of butter to a large pot and melt over medium heat. Once melted, add the flour and stir constantly for about 30 seconds until completely blended. Then, gradually add in the milk and cream, stirring until smooth and incorporated. This takes about a minute. Decrease the heat to low.
Whisk in the shredded cheese about a handful at a time, stirring well between additions until fully blended. Take off the heat and gently toss in the cooked pasta along with the lobster meat. Into the prepared baking dish, transfer everything.
In the meantime, melt the rest of the 2 tbsp butter. Add the panko bread crumbs and mix well. Over the mac and cheese, sprinkle the butter mixture.
Place in the preheated oven and bake the seafood mac and cheese for about 30 minutes or until heated through and the breadcrumbs are golden brown.
Remove the baking dish from the oven when done and serve the seafood mac and cheese right away. Enjoy!