Heat 2 tablespoons oil in 4-quart sauté pan over medium-high heat.
Add onion; cook 3 minutes or until softened.
Add potatoes, carrots, and green beans and cover; cook 10 minutes, stirring occasionally, until potatoes are tender. Remove from pan and set aside.
Heat remaining 2 tablespoons oil in pan over medium heat.
Add thawed steak tips to pan; sprinkle with paprika, salt, and pepper and stir until well coated.
Sauté 3 minutes, then remove from pan and set aside.
Add beef broth and bring to a boil. Reduce heat; simmer about 10 minutes, or until broth is reduced by half.
Whisk in cream and mustard and simmer until thickened.
Return vegetables and steak tips to pan and heat through, stirring occasionally, before serving.