Step 1

Combine ground chuck, Worcestershire sauce and seasoning salt in bowl. Shape mixture into 12 (4-inch) square patties. Place patties onto waxed paper.

Step 2

For each burger, place 1 slice cheese on top of 1 patty; top with another patty. Using fork, crimp edges of patties together to seal. Refrigerate 30 minutes or until firm.

Step 3

Heat gas grill on medium or charcoal grill until coals are ash white.

Step 4

Place patties onto grill. Grill 6 minutes. Turn burgers; continue grilling 4-5 minutes or until internal temperature reaches 160°F or desired doneness.

Step 5

Meanwhile, spread cut bun surfaces with Butter with Canola Oil. Grill, cut-side down, 2-3 minutes or until buns are golden brown.

Step 6

Top bottom half of bun with 1 slice tomato, burger, avocado slices and top half of bun.