How to Make It
Cook rice according to package directions.
Meanwhile, heat 1 tablespoon oil in a large skillet over high. Add beef and cook, tossing often, until only slightly pink, about 3 minutes. Transfer to a bowl.
Add broccolini and remaining 2 tablespoons oil to skillet. Cover and cook, uncovering to toss halfway through, until bright green, about 4 minutes. Uncover and cook, stirring often, until tender and charred, about 2 minutes more. Add chile, if desired, and garlic; cook until softened and fragrant, about 1 minute. Transfer to another bowl.
Whisk together broth, soy sauce, sugar, and cornstarch. Add to skillet and bring to a boil; cook until thickened and glossy, about 1 minute. Serve broccolini and beef over rice, drizzled with sauce.