Egg and Avocado Breakfast Sandwich

Name: Egg and Avocado Breakfast Sandwich
Ingredients: 1 red bell pepper; ¼ medium mango, cut into pieces; 2 tablespoons light brown sugar; 2 tablespoons white wine vinegar; 2 tablespoons fresh orange juice; 1 tablespoon fresh lime juice; ½ teaspoon cayenne pepper; Kosher salt; 9 large eggs; ¼ cup whole milk; ¼ cup (½ stick) unsalted butter; ¾ cup grated extra sharp cheddar; Kosher salt and freshly ground black pepper; 6 kaiser rolls, split, lightly toasted; 1 avocado, sliced; 3 ounces drained pickled cherry peppers or Peppadew peppers, thinly sliced