
Preheat the oven to 400 degrees F.
Pat dry the tilapia fillet with a kitchen towel and keep it aside.
In a small bowl, combine melted butter, lemon juice, lemon zest, garlic, paprika, red pepper flakes, black pepper, and salt. Mix to combine.
Arrange the lemon slices in a 9X13 baking dish and place the tilapia fillet on top.
Pour the prepared garlic butter over the fillet and bake the tilapia for 10-15 minutes until they are cooked and look opaque.
Arrange the tilapia on a serving plate, garnish with chopped parsley, and serve with lemon slices.