Creating your Mushroom and Tofu Stir-Fry is straightforward if you follow these simple steps:

1. Prepare Tofu: Cut the pressed tofu into bite-sized cubes.
2. Heat Oil: In a large skillet or wok, heat 2 tablespoons of vegetable oil over medium-high heat.
3. Cook Tofu: Add the tofu cubes to the skillet. Sauté until golden brown on all sides, about 8-10 minutes. Remove and set aside.
4. Sauté Vegetables: In the same skillet, add the sliced mushrooms and cook for 3-4 minutes, until they begin to soften.
5. Add More Veggies: Add the red bell pepper, broccoli, and carrot. Stir-fry for an additional 3-5 minutes, until vegetables are tender yet crisp.
6. Add Aromatics: Stir in the minced garlic and grated ginger. Cook for another minute until fragrant.
7. Combine Ingredients: Return the cooked tofu to the skillet and mix well with the vegetables.
8. Create Sauce: In a small bowl, whisk together soy sauce, sesame oil, and cornstarch if desired. Pour it over the stir-fry.
9. Stir and Cook: Stir to coat everything evenly and cook for an additional 1-2 minutes until the sauce thickens slightly.
10. Season: Adjust seasoning with salt and pepper according to taste.
11. Plate Up: Remove from heat and garnish with sesame seeds and sliced green onions.

Follow these steps, and you will have a colorful, flavorful Mushroom and Tofu Stir-Fry ready to impress.