Soy Garlic Braised Tofu with Mushroom and Spinach

1 Heat oil in a large pan and add the tofu. Cook until all sides are golden and lightly crisp.
2 Add the garlic and sliced mushrooms. Stir for 2 to 3 minutes until the mushrooms soften and the garlic becomes fragrant.
3 Whisk together the soy sauce, oyster sauce, brown sugar, sesame oil, water, and vinegar if using. Pour the sauce into the pan and let everything simmer for 3 to 4 minutes. Add the spinach and gently toss until it wilts.
4 Add in cornstarch mixture. The sauce will reduce slightly, thicken and coat the tofu and veggies.
5 Serve warm over rice or noodles. Garnish with green onions or sesame seeds if desired.