Preheat the oven to 375°F.
In a medium saucepan over medium heat, melt butter. Once melted, whisk in flour until lightly browned and bubbly. Slowly pour in the milk, stirring continuously until thickened and smooth. Mix all three cheeses and seasonings (optional) until melted and combined.
In a large bowl, combine cooked macaroni, lobster tails and cheese sauce. Mix until the ingredients are well combined.
Pour the mixture into a greased 8×8 baking dish or an oven-safe skillet and bake for 20 minutes or until lightly browned and bubbly. Serve warm.