Preheat your oven to 425°F for the roasted potatoes.
Cut the potato into bite-sized cubes, toss with a little olive oil, minced garlic, salt, and pepper, and spread evenly on a baking sheet.
Roast the potatoes in the preheated oven for about 20-25 minutes or until golden and crispy, stirring halfway through.
While the potatoes roast, pat the sirloin steak dry and season generously with salt and pepper.
Heat a skillet over medium-high heat. Once hot, add the steak and sear for about 3-4 minutes on each side for medium-rare (adjust time based on preferred doneness).
Remove the steak from the skillet and let it rest for a few minutes before slicing.
In the same skillet, add the olive oil and a minced garlic clove. Sauté for about 30 seconds.
Add the fresh spinach and quickly sauté until wilted, about 1-2 minutes. Season with a pinch of salt.
Plate the sliced steak alongside the roasted potatoes and sautéed spinach. Serve immediately and enjoy your balanced, flavorful dinner.