creamy crawfish bisque

Ingredients For creamy crawfish bisque

• 1/2 c

  tony chachere's white gravy mix
• 2 c

  milk
• 2 c

  half and half
• 1/4 c

  margarine
• 1 can

  corn, cream-style
• 2 tsp

  tony chachere's creole seasoning, more if you like it zippy!
• 1 lb

  small or med raw cleaned shrimp
• 1 lb

  crawfish tails the ones i get are already cooked
• 1/2 stick

  real unsalted butter