Cheese, Mushroom and Egg Toasts

Ingredients

• • ½ lb (225 g) white mushrooms, sliced
  • 2 tbsp (30 ml) vegetable oil
  • 1 garlic clove, chopped
  • 1 tbsp (15 ml ) low-sodium soy sauce, plus more for serving
  • 4 slices country bread or white sandwich bread, each ¾ inch (2 cm) thick
  • 3 tbsp butter, softened
  • 2 cups (200 g) medium sharp cheddar cheese, grated
  • 4 eggs
  • 1 small red onion, thinly sliced
  • 2 tsp (10 ml) white wine vinegar
  • 1 package (75 g) alfalfa sprouts (see note)