Bring the steak to room temperature before cooking; pat it dry and rub with olive oil, salt, pepper, garlic powder, and smoked paprika.
Preheat your grill or grill pan over high heat.
Toss zucchini slices with olive oil and a pinch of salt. Grill them for about 2–3 minutes per side until tender and charred.
Place the seasoned steak on the hot grill and cook for about 4–5 minutes per side for medium-rare. Let it rest for 5–10 minutes before slicing.
While grilling, cook your quinoa (or chosen grain) according to package instructions.
In a bowl, mix sour cream or yogurt with Dijon mustard, garlic powder, smoked paprika, salt, and chopped herbs. Add lemon juice if desired.
Slice your rested steak against the grain into thin strips.
Layer your bowls starting with grains at the bottom, topped with grilled zucchini slices and steak, then drizzle with creamy sauce.