Mushroom Toast with Fried Egg

Name: Mushroom Toast with Fried Egg
Ingredients: 3 tablespoons olive oil; 1 shallot , chopped; 1 clove garlic, chopped; 1 pound mushrooms , sliced (button, cremini, shiitake, baby portabella, or a mix); 1/2 teaspoon salt, or more to taste; 1/4 teaspoon freshly ground black pepper , or more to taste; 1/4 cup chicken stock, or more if needed; 3 tablespoons chopped fresh parsley; 3 tablespoons (1 1/2 ounces) butter , plus extra for buttering the toast; 4 large eggs; 4 slices bread , any favorite kind