Place the chuck roast into the slow cooker. Add in the pepperoncinis peppers, pepperoncinis juice, and ranch seasoning.
Turn the slow cooker on low for 8-10 hours. The meat will be ready when it is tender and it begins to shred apart.
Notes
Sear first (totally optional): I've tried both ways seared and un-seared and I don't notice a difference. But if you want another step, sear the roast in a oiled hot pan for 2–3 minutes per side before adding to the slow cooker.
Make it a meal: Serve over mashed potatoes, or with roasted veggies for a balanced meal! This recipe goes great with my Spicy Garlic Green Beans!
Low for 8-10 hours or high for 4-6 hours: Low and slow is the way to go. But, if you're in a time crunch, cooking on high works too, you may not have as tender of a roast though.