Mushroom & Tofu Stir-Fry

Heat 2 tablespoons oil in a large flat-bottom wok or cast-iron skillet over high heat. Add mushrooms and bell pepper; cook, stirring occasionally, until soft, about 4 minutes. Stir in scallions, ginger and garlic; cook for 30 seconds more. Transfer the vegetables to a bowl.

Add the remaining 2 tablespoons oil and tofu to the pan. Cook, turning once, until browned, 3 to 4 minutes. Stir in the vegetables and oyster sauce. Cook, stirring, until hot, about 1 minute.