Heat olive oil in a large skillet over medium heat.
Add diced onion and cook for 3 minutes until softened.
Add minced garlic and cook for 1 minute until fragrant.
Add ground beef to the skillet, breaking it apart with a spoon. Cook until browned and no longer pink, about 6-8 minutes.
Drain excess fat from the skillet if necessary.
Stir in uncooked rice, salt, black pepper, paprika, and dried oregano. Cook for 1 minute to toast the rice slightly.
Pour in beef broth and bring the mixture to a boil.
Reduce heat to low, cover the skillet, and simmer for 15 minutes.
After 15 minutes, stir in frozen mixed vegetables, cover again, and cook for an additional 5 minutes until rice is tender and vegetables are heated through.
Remove from heat and let the skillet sit covered for 5 minutes before serving.