If you are letting your steak marinate in a bowl, you will want to cover the bowl with some plastic wrap.
The calorie count on this recipe is deceiving because you don't eat all the marinade so I would not calculate that into your meal.
The longer you let your steak sit the more flavor it will absorb. When you have the time, I recommend letting your steak rest for an hour rather than 30 minutes.
You can prep this marinade ahead of time and store it in a Ziploc bag or plastic container for up to 3 days.
You can use any cut of steak with this recipe. For a higher end meal, try using a filet mignon. For a more budget friendly option, grab a couple of flank steaks.
The red pepper flakes add a tiny bit of heat to help balance the sharpness of the garlic and savoriness of the Italian seasoning.