16 ounces corkscrew pasta |
6 tablespoons melted butter, divided |
2 large garlic cloves, minced |
1/2 cup finely chopped red onion |
1/4 cup all-purpose flour |
3 cups whole milk, at room temperature |
1 1/2 cups (6 ounces) grated sharp cheddar cheese |
1 1/2 cups (6 ounces) grated gruyčre cheese |
1 tablespoon dijon mustard |
1/2 cup minced fresh chives |
1/8 teaspoon cayenne pepper |
1/2 teaspoon salt, divided |
1/2 teaspoon freshly ground black pepper, divided |
1 pound coarsely chopped cooked lobster meat |
2 cups oyster crackers, crushed |