Place saltines in a zip lock bag and crush with a rolling pin or place in a bowl and crush by hand. Spray or grease a 2 quart casserole dish. Drain oysters place reserve oysters and juice. Slice sticks of butter, very thin.
We are going to make three layers:
Place 1 cup of crushed saltines in the casserole dish. Place 1/3 of the oysters on the crackers. Put a slice of butter on each oyster. Sprinkle lightly with salt and pepper
Make a second layer of crackers, oysters, butter, S&P and a third layer of crackers, oysters, butter, S&P. Finish top with crackers.
Place oyster liqueur and milk in a bowl, stir to combine. Pour over casserole. Place the casserole on a sheet pan to catch any liquid that bubbles over. Bake uncovered in a 350-degree over for about an hour