1. In a shallow dish, combine the flour, paprika, garlic powder, salt and pepper. One side at a time, coat the tilapia fillets in the flour. Set aside.
2. In a large cast iron skillet over medium-high heat, melt 1/4 cup of the butter. Once the butter is melted and beginning to sizzle, add the tilapia fillets side by side in the skillet. Cook the fish for about 5-6 minutes before flipping and cooking for another 5-6 minutes on the other side, or until it flakes easily with a fork*.
3. When the fish is cooked, remove it to a plate and keep warm in the oven. Add the remaining butter to the skillet, and once the butter starts sizzling use a spatula to scrape up any brown bits, and squeeze the lemon juice into the pan. Let the sauce simmer for a couple of minutes, then remove from heat. Plate the fish (and any potatoes or rice you may have cooked) and drizzle the lemon butter sauce all over the dish. Sprinkle with parsley and serve immediately!

Leftovers may be kept in an airtight container in the fridge, for 1-2 days.