Pat the sirloin tip roast dry with paper towels
Trim excess fat and silver skin if needed
Season all sides with salt, black pepper, garlic powder, and onion powder
Let the roast sit at room temperature for 30 to 60 minutes
Preheat the oven to 325°F
Heat a skillet over medium-high heat with a little oil
Sear the roast on all sides until browned
Place the roast in a roasting pan or oven-safe dish
Add optional vegetables such as onions, carrots, and potatoes
Insert a meat thermometer into the thickest part of the roast
Roast until the internal temperature reaches 130°F to 135°F for medium-rare or 140°F to 145°F for medium
Remove the roast from the oven
Tent loosely with foil
Let rest for 15 to 20 minutes
Slice thinly against the grain
Serve immediately