Preheat oven to 375°F

Heat butter in skillet on medium heat

Place one piece of tilapia on a piece of foil

Brush butter on both sides of the tilapia

Season with salt and pepper to taste

Wrap the foil tightly around the tilapia

Repeat for each piece of tilapia

Place foil packages on the baking sheet

Bake for 30 minutes in preheated oven

Serve