Kid-friendly Fastest French Onion Soup in a Mug + Cheesy Gruyère Croutons Recipe - Sticky Fingers Co

Ingredients

• 1 T butter **(for DAIRY ALLERGY sub olive oil)**
• 1 small or 1/2 large yellow onion
• 1/4 tsp salt
• 1 C veggie broth
• 1 tsp apple cider vinegar
• 1 pinch black pepper
• 1 pinch sugar (optional)
• 1 slice French, Italian, or whole wheat bread **(for GLUTEN ALLERGY sub gluten-free/nut-free bread)**
• 1 oz/slice Gruyère, Swiss, or provolone cheese **(for DAIRY ALLERGY sub Daiya brand dairy-free cheese shreds)**