To cook tilapia in the oven:

1. Preheat the oven to 400°F (around 425°F for some recipes).
2. Place tilapia fillets in a baking dish.
3. Season the fillets with salt, pepper, and optionally paprika, garlic powder, oregano, or other spices.
4. Prepare a mixture of melted butter, lemon juice, minced garlic, and herbs like parsley or oregano.
5. Pour the butter mixture over the tilapia fillets.
6. Optionally, add lemon slices on top of the fish.
7. Bake for 10 to 15 minutes until the fish turns white and flakes easily with a fork.

This simple method results in tender, flavorful baked tilapia perfect for a quick and healthy meal.