Preheat oven to 350. Grease a 8x8 or similar sized casserole dish.
In a large skillet over medium heat, cook vegetables in butter until soft. Add oysters and liquid, cook until oysters curl. Remove from heat and allow to cool slightly.
Combine eggs, milk and seasonings.
In a large bowl, lightly toss bread cubes with cooled vegetables. Add liquids and fold to combine. Be careful not to over mix and/or break apart the bread cubes too much.
Transfer to your prepared casserole dish. Bake at 350 for 20-30 minutes, uncovered or until cooked through and brown on top.