Prepare the chimichurri sauce by combining parsley, cilantro, garlic, red pepper flakes, olive oil, red wine vinegar, salt, and pepper in a medium bowl. Mix well and set aside.
Marinate the steak by tossing the bite-sized pieces with olive oil, garlic powder, onion powder, smoked paprika, salt, and pepper. Optionally, marinate in half of the chimichurri sauce for at least 30 minutes.
Cook the marinated steak bites in a preheated skillet over medium-high heat for about 3-4 minutes, turning occasionally until browned and cooked to desired doneness.
Serve the steak bites on a platter, drizzled with chimichurri sauce and additional sauce on the side for dipping.