In a jar or container with a lid, combine the cornstarch and cold water and shake well to mix. Put this aside somewhere cool.
In a bowl, mix together all the other ingredients for the sauce and set it aside until needed.
Get all your remaining ingredients measured and ready before cooking.
Season the ground beef evenly with garlic salt, onion powder, celery salt, and black pepper.
Heat the oil in a large skillet over medium-high heat, then add the ground beef. Cook it, breaking it up, until it’s no longer pink and nicely browned. Drain the fat and remove the beef from the skillet.
Pour the white wine into the skillet and lower the heat to medium. Use a spatula to scrape the pan’s bottom and sides to loosen any browned bits. Let the liquid reduce by half, which will take about 3 minutes.
If needed, add a bit more oil. Toss in the broccoli, green beans, mushrooms, onions, and celery. Stir them to coat with oil and cook for 3 minutes until they start to soften.
Add in the carrots and red bell peppers. Continue cooking and stirring for another 2 minutes.
Pour in the prepared sauce, bringing the mixture gently to a boil. Let it simmer and reduce slightly for 2 to 3 minutes.
Give the cornstarch slurry a good shake, then slowly stir it into the bubbling sauce until it thickens to your liking. Turn the heat down low.
Return the cooked ground beef along with any juices back to the skillet, stirring it all together. Let everything heat through for about 2 minutes.
Serve the stir fry over cooked rice or noodles as desired.