Preheat grill to medium-high heat. Lightly brush grill with oil to prevent sticking. Line Sheet Pan with Sheet Pan Liner.
In a large bowl, add beef and 1⁄2 pkg seasoning (about 1⁄4 cup). Using a fork or your hands, gently mix to combine.
Form into four patties. Place patties on Sheet Pan Liner and head to the grill.
Grill patties, with lid closed, 4–5 min per side, or until cooked through. Top each patty with 1 slice of cheddar cheese during last 1 min of cooking to melt cheese. Remove Sheet Pan Liner from pan. Place cooked patties on top of pan.
In 4-Cup Prep Bowl, whisk remaining 1⁄2 pkg seasoning with water and tomato paste. Microwave sauce, uncovered, on high 2 min, whisking halfway until thickened.
Slice buns in half and place patties on bottom halves of buns. Drizzle 2 tbsp sauce on top of each patty; add more to taste. Add toppings, if desired. Cover patties with top halves of buns.
Per serving (1 burger with 2 tbsp sauce): Calories 450, Fat 20 g (Saturated 9 g, Trans 0.5 g), Cholesterol 80 mg, Sodium 630 mg, Carbohydrate 35 g (Fiber 2 g, Sugars 5 g), Protein 32 g.