Heat 1 tbsp oil in skillet over med; thinly slice onion + sauté 8-10 min until browned; season with salt + add 2 tbsp water; cover + cook 3-5 min until softened; set aside

p>Heat lightly oiled large skillet over high; cook burgers with salt/pep 3 min on one side; flip over, cook 2 min, then add 1 slice of cheese to each; cover pan + cook 1-2 more min until cooked through + cheese has melted

Toast 2 buns until warm + golden; top buns with burgers, a handful of spinach + onions

Add remaining spinach to a large bowl, drizzle on 2 tbsp vinegar or lemon juice, 1 tbsp oil + salt/pep then toss to combine; serve burgers alongside salad—yum!

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