Cheesy French Onion Soup - Alberta Milk

Ingredients

• 2 tbsp (30 ml) butter
• 2 medium sized onions, thinly sliced
• 1 tbsp (15 ml) all-purpose flour
• 2 cups (500 ml) reduced-sodium beef broth
• French baguette, cut into small cubes
• 1/2 cup (125 ml) grated Gruyere cheese