Creating the 30-Minute Beef Stir Fry with Vegetables is both easy and enjoyable if you follow these simple steps:

1. Prep the Ingredients: Slice the beef thinly against the grain. Chop your vegetables into bite-sized pieces for even cooking.
2. Make the Sauce: In a small bowl, combine soy sauce, oyster sauce (if using), cornstarch, and beef broth (or water). Mix well and set aside.
3. Heat the Oil: In a large skillet or wok, heat the vegetable oil over medium-high heat until shimmering.
4. Stir-Fry the Beef: Add the sliced beef to the skillet in a single layer. Cook for 2-3 minutes until browned, stirring occasionally.
5. Add Aromatics: Stir in the minced garlic and ginger, cooking for another 30 seconds until fragrant.
6. Add Vegetables: Toss in the mixed vegetables and stir-fry for about 3-4 minutes until they are tender yet crisp.
7. Add Sauce: Pour the prepared sauce over the beef and vegetables. Toss everything together to coat evenly.
8. Thicken the Sauce: Continue cooking for 1-2 minutes, allowing the sauce to thicken and coat the ingredients well.
9. Season: Taste and adjust seasoning with salt and pepper as desired.
10. Serve: Immediately serve the stir fry over cooked rice or noodles.

These straightforward instructions will guide you in creating this incredible dish effortlessly.