Heat the olive oil in a large skillet over medium-high heat. Season the beef tips generously with salt and pepper.
Sear the beef in batches until browned on all sides (about 2–3 minutes per batch). Transfer the browned beef to the crockpot.
Step 2: Sauté the Vegetables
In the same skillet, sauté the chopped onion and minced garlic until softened (about 3–4 minutes).
Add the sliced mushrooms and cook until they release their moisture and begin to brown (about 5–7 minutes). Transfer the vegetables to the crockpot.
Step 3: Build the Sauce

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