Slow Cooker Beef Roast and Carrots

-pound boneless beef chuck shoulder roast (No substitutions!  This is the best cut of meat for the slow cooker!)

carrots, peeled and chopped into bite-sized pieces

extra virgin olive oil

red wine vinegar

seasoning packet (We love the McCormick mesquite and chipotle seasonings) or 3 tablespoons of your favorite homemade seasoning mix (Like homemade taco seasoning.  Yum!)