1.
Preheat oven to 425 degrees. Lightly coat a 9×13 baking dish with nonstick spray. Toss the potatoes with 2 Tbsp. of olive oil, garlic, Italian seasoning, and some salt and pepper. Bake for 25-30 minutes until tender, mixing once to prevent sticking.
2.
Pat steaks dry with paper towels, season with salt and pepper, and coat with the remaining with 1 Tbsp. of oil.
3.
Heat a large nonstick pan over medium-high. Cook steaks until well browned and have an internal temperature of 125 degrees (for medium-rare), about 3 minutes per side, depending on the thickness of your steaks. Brush tops of steaks evenly with the mustard and sprinkle with the herbs.
4.
Serve alongside the potatoes.