To make easy oven-baked pork sirloin cutlets, sprinkle the cutlets with cornstarch, coat them in beaten egg, and dredge each cutlet in seasoned bread crumbs to coat both sides evenly. Bake the pork sirloin cutlets for approximately 16 minutes at 400 degrees Fahrenheit, or until the exterior is golden.
Alternatively, baking a boneless pork sirloin roast is another easy preparation method. Allow the roast to warm to room temperature by removing it from the refrigerator approximately 30 minutes before roasting it. While the meat warms, make a rub by combining 3 tablespoons olive oil with 1 tablespoon chopped garlic, 1 1/2 teaspoons kosher salt, and 3/4 teaspoon black pepper. Whisk in 1 1/2 teaspoons chopped fresh sage, 1 1/2 teaspoons chopped fresh rosemary, 2 teaspoons chopped fresh thyme and 2 teaspoons finely grated orange zest.
Coat the exterior of the pork sirloin roast with the rub, and place it on a greased rack set in a roasting pan. Roast the pork for approximately 55 to 75 minutes at 350 F. Remove the pork from the oven, cover it loosely with aluminum foil, and let it rest for 10 to 15 minutes before carving and serving it.
To check for doneness, insert an instant-read thermometer in the thickest part of the cutlet or roast. The U.S. Department of Agriculture recommends cooking pork to a minimum internal temperature of 145 F.