In a small bowl, mix olive oil with minced garlic, chopped rosemary, chopped fresh sage, chopped fresh thyme, paprika, salt, and pepper until combined. Rub the mixture over the turkey roast, covering the top, bottom, sides and under the skin.
Place the turkey on top of the vegetables and herbs in the slow cooker. This allows for air circulation around the roast, which will help ensure that nothing sticks to the bottom of the crockpot.
Cook for 5-6 hours on low or until internal temperature reaches 155 degrees F. Periodically test internal temperature with a meat thermometer. This is an important step to prevent overcooking since the cooking time will depend on the size of the roast and how cold it is when you put it into the slow cooker.
Once the turkey roast reaches 155-160 degrees F, remove from the slow cooker and place in a roasting pan. Broil on low for 5-10 minutes or until the surface is lightly browned and crispy and the internal temperature reaches 165 degrees F.
Remove from the oven and tent it with foil for 15 minutes before cutting, to allow the juices to infuse back into the meat.