Preheat oven to 350 degrees

In a large pot on medium to high heat, cook bacon on both sides until crispy. Drain pieces on a paper towel lined plate.

Melt your 2 tbsp butter on medium heat, then add in yellow onion and saute until fragrant, then stir in garlic, seasonings, and flour. Stir for 30 seconds.

Add potatoes, broth, and ½ of green onions. Bring to a boil, then reduce heat, cover, and simmer for 10-15 minutes, or until potatoes are tender.

While soup simmers, melt 2 tbsp butter and make grilled cheese sandwiches. Once done, cut each sandwich into 1 inch cubes, place on parchment lined cookie sheet and bake for 5 minutes

Stir in corn, crawfish tails (or shrimp) then room temperature cream and simmer on low for 3-5 minutes. Season with more salt, to taste, Remove from heat and serve. Garnish with chopped bacon, remaining green onions, and grilled cheese croutons.