For the chipotle mayonnaise: Remove peppers from can (you may want to use rubber gloves if sensitive to peppers). Carefully split open and scrape out seeds. Finely chop peppers; set aside.
In a small bowl, stir together 1 1/2 teaspoons chopped chipotle peppers and mayonnaise; set aside covered in refrigerator until ready to use.
For the burgers: In a mixing bowl, stir to combine ground beef, chili seasoning, 2 teaspoons chopped chipotles, and beer. Wet your hands to prevent sticking and shape into 4 patties slightly larger than the buns; set aside covered in refrigerator if not cooking immediately.
Set up grill for direct cooking over high heat. Brush and oil grill before cooking.
Season burgers with salt and pepper and place on hot oiled grill. Cook 4 to 5 minutes per side for medium. Place cheese slices on burgers 2 to 3 minutes before burgers are done.
Serve hot on toasted bun with lettuce, tomato, onion, sliced avocado, if desired, and a dollop of chipotle mayonnaise.
INDOOR: Follow instructions for preparing burgers. Preheat broiler. Place burgers on wire rack over foil-lined baking sheet or broiler pan. Broil 6 inches from heat source for 4 to 5 minutes per side for medium. Place cheese slices on burger 1 to 2 minutes before done. Serve hot on toasted bun with lettuce, tomato, onion, sliced avocado (if desired), and a dollop of chipotle mayonnaise.
Chipotle chiles are smoked, dried jalapenos and are often found packed in adobo sauce which is a spicy dark red sauce made from tomatoes and herbs. Chipotles in adobo can be found in the Mexican foods section of the grocery store.