Thai Beef Stir Fry

This is tasty!!! It is also fairly simple. Hope you like it as much as I do:

Thai Beef Stir-Fry

½ c brown sugar
2 tbls cornstarch
2 c beef broth
1/3 c soy sauce
1 tsp onion powder
1 tsp ground ginger
¼ tsp hot pepper sauce
2 tbls boneless beef sirloin steak, cut into thin strips
6 tbls olive oil, divided
2 c fresh cauliflower
1 ½ c julienned carrots
4 c broccoli florets
2 c mushrooms
¼ c peanut butter
Spaghetti
½ c chopped peanuts

Combine first 8 ingredients until smooth. Set aside. In a large skillet or wok, stir-fry beef in 4 tbls oil until meat is no longer pink. Remove and keep warm.
In the same skillet, stir fry cauliflower and carrots in remaining oil for 5 minutes. Add broccoli, stir fry for 7 minutes. Add mushrooms, stir fry 6-8 minutes longer or until the veggies are crisp-tender.
Stir broth mixture and add to the pan. Bring to boil; cook and stir for 2 minutes ‘til thick. Reduce heat, add beef and peanut butter. Cook and stir on medium until blended. Serve over rice or noodles. Sprinkle with peanuts.