Prepare the fish fillets by rinsing them under cold water and patting them dry thoroughly with paper towels.

Preheat the oven to 400°F (200°C) if baking, or heat about an inch of oil in a skillet over medium-high heat until shimmering.

Mix the batter by whisking together flour, baking powder, salt, and black pepper in a bowl. Gradually add milk until smooth like pancake batter.

Dip the fish fillets into the batter, ensuring they are evenly coated.

For baking, place the coated fillets on a lined baking sheet and bake for 15–20 minutes, flipping halfway through.

For frying, place the battered fillets into the hot oil and fry each side for 3–4 minutes until golden brown.

Serve the cooked batter dipped fish with your favorite dipping sauces and side dishes.