Beat The Egg With Milk In A Shallow Bowl. In Another Shallow Bowl, Mix Together The Bread Crumbs, Roasted Onion Flakes, Garlic, Blackened Seasoning, Crushed Red Pepper Flakes, Black Pepper, And Sea Salt. Dip A Tilapia Fillet Into The Egg Mixture, Then Press Gently Into The Crumb Mixture On Both Sides; Set The Coated Fillet Onto A Plate. Repeat With Remaining Fillets; Refrigerate The Coated Fillets For About 15 Minutes To Help Set The Crumbs. Heat The Olive Oil And Butter In A Cast-Iron Frying Pan Over Medium Heat. Lay The Fillets Into The Skillet, And Pan-Fry Until Golden Brown On Each Side, About 3 Minutes Per Side. The Fish Should Be Opaque And Flaky Underneath The Coating. Remove And Drain Fillets On Paper Towels.