
2 tablespoons olive oil
1 medium yellow onion, thinly sliced
2 cups beef broth
2 tablespoons Worcestershire sauce
1 tablespoon soy sauce
1 teaspoon salt
0.5 teaspoon black pepper
1 teaspoon garlic powder
2 tablespoons cornstarch
2 tablespoons water
Thick-sliced white or sourdough bread for serving