Cheesy French Onion White Beans

Ingredients

- 4 servings +

• 3 yellow onions, thinly sliced
• 2 tbsp butter
• 1 tbsp olive oil
• 1 tsp sugar, optional, to help caramelisation
• 3 cloves garlic, minced
• 1 tbsp fresh thyme leaves, plus more for serving
• 2 cans cannellini beans, 15 oz each, drained and rinsed
• ¾ cup vegetable broth, low-sodium
• 1 tbsp Dijon mustard
• 1 ½ cups Gruyère cheese, shredded
• ½ tsp kosher salt
• ¼ tsp black pepper