Preheat An Oven To 350 Degrees F (175 Degrees C). Brush Each Salmon Fillet On All Sides With Olive Oil And Arrange Into The Bottom Of A Glass Baking Dish With The Skin Side Facing Down. Scatter The Tomatoes, Feta Cheese, Onion, Basil, And Olives Over The Fillets; Sprinkle With The Lemon Juice. Bake In The Preheated Oven Until The Salmon Flakes Easily With A Fork, About 20 Minutes.