Preheat oven to 350F.

Melt butter over medium heat in a large skillet. Add green onions and red bell pepper. Cook, stirring occasionally, until peppers are tender. Add garlic and crawfish tails and cook about 5 minutes. Lower heat to low and add creole seasoning, cream cheese, and half of the Parmesan cheese; stir until cheeses are melted.

Transfer to a casserole dish and top with remaining cheese.

Bake about 15 minutes, or until bubbly. Serve hot.