Start by preheating your oven to 425°F for the potatoes and green beans.
Cube the russet potato into small bite-sized pieces. Toss them with one teaspoon of olive oil, minced garlic, salt, pepper, and chopped fresh parsley.
Spread the potatoes on a baking sheet in a single layer and roast in the oven for about 20-25 minutes or until golden and tender, stirring halfway through.
Meanwhile, trim the ends off the green beans. Toss them lightly with the remaining teaspoon of olive oil, a pinch of salt, and pepper. Arrange them on another baking sheet and roast for about 12-15 minutes until they become crispy.
While the vegetables roast, heat a skillet over medium-high heat. Pat the steak dry and season generously with salt and pepper.
Place the steak in the hot skillet and sear for 3-4 minutes on each side (depending on thickness and desired doneness), allowing a nice crust to form.
Let the steak rest for a few minutes before slicing against the grain.
Plate the sliced steak alongside the garlic herb roasted potatoes and crispy green beans, and serve immediately.