If fish fillets are large, cut into 4 serving pieces. Arrange in ungreased square baking dish, 8 x 8 x 2 inches. Sprinkle with paprika, salt and pepper.
Melt butter in 10-inch skillet over medium heat. Cook mushrooms and leeks in butter, stirring occasionally, until leeks are tender. Stir in wine. Pour mushroom mixture over fish. Sprinkle with almonds and cheese.
Bake uncovered 15 to 20 minutes or until fish flakes easily with fork.