Wash the Tilapia fillets and pat them dry.
Arrange the fillets in a baking tray.
Mix lemon juice, butter, garlic, red chilli powder, salt and black pepper in a bowl.
Pour this mixture over the tilapia.
Arrange lemon slices in between the fillets.
Pre-heat the oven to 180 degrees C (350 Degrees F).
Bake the fish for 15-20 minutes.
Garnish with fresh parsley.