Slice the steak very thinly lengthwise, against the grain, into strips about ¼ inch thick and 4-5 inches long. For easier slicing, you can also pop the steak in the fridge for about 10 minutes before slicing. This firms it up a bit.
In a bowl, toss the steak strips with soy sauce, garlic powder, black pepper, and dried chili flakes.
Take a small bundle of enoki mushrooms and wrap a slice of seasoned steak tightly around it. You don't want the bundle of enoki to be too thick, as you want it to finish cooking through by the time the steak is done. Repeat until all the steak and enoki are used.
Heat the neutral oil in a skillet over medium-high heat. Add the steak-wrapped enoki bites in a single layer (cook in batches if needed). Make sure the steak is sliced thinly so that the inside wrapped around the enoki cooks through quickly. Sear on all sides for about 45 seconds to a minute per side, watching carefully to prevent burning. The steak might unwrap a little in the pan, so if you're concerned about that, you can use a toothpick to keep it together.
Carefully place the seared Enoki-Wrapped Steak Bites on top of your finished bowl of instant ramen.