You can use a slow cooker for cooking pork tenderloin and veggies at the same time easily. Marinate the tenderloin with your favorite sauce, and place it in the slow cooker with potatoes or veggies such as butternut squash or carrots. Cook on low heat for seven to eight hours or on high heat for four hours. Add pork tenderloin to your shopping cart on the Instacart app, and make your day easier by having all your groceries delivered to your door in as little as 2 hours!