Without a doubt, crockpot beef tips will become one of your favorite slow cooker comfort food recipes!
Season beef tips with salt and pepper. Melt butter in a skillet and add beef tips. Allow the beef to sear about 4 minutes on each side.
Place beef in the slow cooker and top with onions and garlic cloves along with a sprig of fresh thyme.
Reduce the heat of the skillet and melt butter. Add mushrooms to the skillet with salt and stir. Saute for about 5 minutes.
Add water and beef base to the skillet and combine. Add to the slow cooker. Cover and cook on low for about 5 hours.
Combine red wine with cornstarch and add to the slow cooker. Turn heat up to high and cook for 20 minutes.
Serve beef tips over mashed potatoes and enjoy!