Preheat your oven to 425°F for roasting the asparagus and sweet potatoes.
Peel and cut the sweet potato into thin rounds or small cubes for crisping.
Toss the sweet potato pieces with half a teaspoon of olive oil, salt, pepper, and a little chopped rosemary. Spread them on a baking sheet.
Arrange the asparagus spears on another baking sheet, drizzle with olive oil, and season with salt, pepper, minced garlic, and thyme leaves.
Place both baking sheets in the oven. Roast sweet potatoes for about 20-25 minutes until crispy and golden, and roast the asparagus for about 10-12 minutes until tender-crisp.
While the vegetables roast, pat dry the 4 oz filet mignon. Season it generously with salt and pepper.
Heat a skillet on medium-high heat. Once hot, add a small drizzle of olive oil.
Sear the filet mignon for about 3-4 minutes on each side, adjusting time depending on your preferred doneness.
Let the steak rest for a few minutes before slicing.
Plate the filet mignon alongside the herb roasted asparagus and crispy sweet potatoes. Garnish with fresh rosemary or thyme as desired and serve immediately.