Savory Apple Naan Flatbread

Ingredients

• 3 slices bacon, cut crosswise into 1/2-inch pieces
• 1 medium unpeeled apple, cored and sliced
• 1 small red onion, sliced
• ½ teaspoon dried thyme
• 2 tablespoons white balsamic vinegar
• salt and ground black pepper to taste
• 3 Naan Flatbreads
• 1 teaspoon olive oil
• ½ cup shredded Gruyere cheese
• ½ cup arugula, or to taste