Stir in the sliced onion and minced garlic over the beef.
In a medium bowl, whisk together brown gravy mix, onion soup mix, Coca Cola, beef broth, Worcestershire sauce, onion powder, and garlic powder until smooth.
Pour the mixture evenly over the beef and onions in the slow cooker. Stir gently to coat.
Cover and cook on LOW for 7–8 hours or HIGH for 4 hours, until beef is fork-tender.
Thicken if needed: If you want a thicker gravy, whisk 1 tablespoon cornstarch with 2 tablespoons water, stir into the slow cooker, and cook on HIGH for an additional 15 minutes.
Garnish with parsley if desired. Serve beef tips and gravy over mashed potatoes, rice, or egg noodles.
Notes
Tips & Tricks
Brown the beef first: It’s optional, but searing adds a richer flavor.
Don’t use diet soda: Regular cola gives the right sweetness and depth.
Liquid level: Stick with ½ cup broth + 1 cup cola for a thicker gravy, but you can add a little extra broth if you want more sauce.
Cut beef evenly: Similar-sized chunks cook at the same rate and shred evenly.
Taste before serving: Onion soup and gravy mixes can be salty, so add extra salt at the end if needed.
Make it creamy: Stir in a splash of heavy cream at the end for a velvety sauce.
Substitutions
Beef stew meat → use sirloin tips, chuck roast cut into chunks, or even venison.
Coca Cola → Pepsi or root beer (root beer gives a slightly different sweetness).