Put the skillet in the oven and preheat to 350ºF. Drain the sardines and place them into a mixing bowl with the tomatoes, onion, mushrooms, garlic powder, parsley, salt, and pepper. Mix well, making sure the sardines are broken down.
1 can of King Oscar's Skinless & Boneless Sardines in Olive Oil, drained, 1/2 cup sliced grape tomatoes, 1/4 cup finely chopped red onion, 1/4 cup finely chopped mushrooms, 1/4 tsp garlic powder, 1/4 cup chopped fresh parsley , Sea salt and cracked black pepper, to taste