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Slice the Sirloin Tips into large cubes.
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Preheat a pan over medium/high heat. Add the sirloin tips to the pan and brown. Unless you have a gigantic pan, I would do this in batches so that the meat browns evenly.
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While you are browning the meat. Dice up the onions and garlic.
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When the meat is fully browned add it to the crock pot along with the onions and garlic.
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Slice the mushrooms and add them to the crock pot.
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Add two cans of cream of mushroom soup, 1 bag of lipton onion soup mix and 2 cans of beef broth.
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Cook for 8 hours on low.
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In the last hour of cooking, mix two tablespoons of cornstarch into 1/4 cup of cold water. Then add it to the crock pot. This will thicken the sauce. If you wish to have a thinner sauce, you can skip this step.
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Serve over mashed potatoes, rice or my favorite, egg noodles.