Prepare the slow cooker: Lightly spray the inside of your slow cooker with cooking spray or rub with a little oil to help with cleanup later.
Layer the onions: Place the sliced onions in an even layer on the bottom of the slow cooker. This creates a flavorful bed for the chicken and keeps it from sticking.
Season the chicken: Pat the chicken thighs dry with paper towels. Sprinkle the dry onion soup mix (or chicken seasoning blend) evenly over all sides of the chicken thighs, pressing gently so it clings.
Add chicken and broth: Arrange the seasoned chicken thighs on top of the onions in a single layer as much as possible. Pour the chicken broth around (not directly on top of) the chicken so you don’t rinse off the seasoning.
Cook on low: Cover the slow cooker with the lid and cook on LOW for 6–7 hours, or until the chicken is very tender and easily pulls away from the bone. If you’re in a hurry, you can cook on HIGH for 3–4 hours, but low and slow gives the best texture.
Adjust seasoning: Once done, taste a spoonful of the cooking liquid. If needed, add a pinch of salt or pepper to taste and gently stir the onions and juices around the chicken.
Serve: Carefully remove the chicken thighs with tongs—they’ll be very tender. Spoon the soft onions and some of the pan juices over the top. Serve hot with your favorite sides, making sure everyone gets a little extra sauce on their plate.
Variations & Tips
For picky eaters, you can use a milder chicken seasoning instead of onion soup mix and slice the onions very thin so they almost melt into the sauce—kids often don’t even notice them. If your family likes a creamier sauce, stir in 1/2 cup of sour cream or plain Greek yogurt at the end of cooking (turn the slow cooker to WARM and whisk it into the juices until smooth). To make it a more complete one-pot meal, add baby potatoes or thick carrot chunks on top of the onions before adding the chicken; they’ll soak up the flavor and cook right along with everything else. For a slightly sweeter twist, tuck in a few sliced carrots and a drizzle (about 1 tablespoon) of honey over the chicken before cooking. If you prefer boneless, skinless chicken thighs, reduce the cook time a bit—check for doneness around 4–5 hours on LOW. And for families watching sodium, choose low-sodium broth and use only part of the seasoning packet, then brighten the flavor at the end with a squeeze of lemon juice instead of extra salt.
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