1 (6 oz.) ground chuck, shaped into a burger

• 3 tsp. olive oil, divided

• 1 burger bun

• 2 tsp. Dijon mustard

• 1/2 small onion, sliced

• 2 thick slices bacon, cut in half

• 1 slice Sargento^® Sliced Sharp Cheddar Cheese

• 1 slice (1/4-inch thick) ripe beefsteak or heirloom tomato

• 1/4 tsp. salt

• 1/4 tsp. pepper

• 1 slice Sargento^® Sliced Baby Swiss Cheese