Air Fryer White Bean and Mushroom Tartine

Ingredients

• 2 tbsp (30 ml) butter
• 454 g sliced crimini mushrooms (about 4 cups)
• Sea salt and freshly ground pepper, to taste
• 1 19 oz (540 ml) can white kidney beans, drained and rinsed
• 2 tbsp (30 ml) mayonnaise
• 2 tbsp (30 ml) fresh lemon juice
• Zest of 1 lemon
• ¼ tsp (1 ml) garlic powder
• 2 tbsp (30 ml) chives, minced, plus more for garnish
• 1 tbsp (15 ml) olive oil
• 8 1” slices sourdough bread
• ½ cup (125 ml) shredded mozzarella cheese