Step 1: Add the Chicken to the Slow Cooker - Place the chicken legs in the bottom of your slow cooker in as even a layer as you can manage. They do not have to look perfect, because this is not a fancy restaurant kitchen, this is dinner at home. The main thing is to give the chicken enough room so the sauce can get around each piece. If a few pieces overlap, that is fine, but try not to pile them too tightly.
Step 2: Season the Chicken Well - Sprinkle the salt, pepper, and onion powder evenly over the chicken legs. This small step matters more than folks think. Seasoning the chicken before the sauce goes on helps every bite taste good, not just the outside where the sauce lands. I like to turn the pieces a little with clean tongs so the seasoning finds its way around the meat.
Step 3: Whisk the Maple Dijon Sauce - In a bowl, whisk together the maple syrup, Dijon mustard, brown sugar, apple cider vinegar, and minced garlic. The sauce will look smooth, shiny, and a little thick. This is where the magic starts. The maple syrup gives sweetness, the mustard brings tang, the vinegar adds brightness, and the garlic makes the whole kitchen smell like somebody knows what they are doing.
Step 4: Pour the Sauce Over the Chicken - Pour the sauce over the chicken legs, making sure each piece gets a good coating. Use a spoon or tongs to nudge the sauce around if needed. Do not worry if the slow cooker looks like it needs more liquid at first. As the chicken cooks, it releases juices, and those juices blend right into the maple Dijon sauce. By the end, you will have plenty to spoon over the chicken.
Step 5: Cook Until Tender - Cover the slow cooker and cook on LOW for 5 to 6 hours or on HIGH for 3 to 4 hours. I prefer LOW when I have the time because the chicken turns especially tender and the flavors settle in nicely. The chicken is done when it is cooked through and tender enough to pull away from the bone easily. That is the point where dinner starts smelling so good that people wander into the kitchen pretending they are just passing through.
Step 6: Broil for Color If You Like - If you want the chicken legs to look extra pretty, move them carefully to a foil lined baking sheet and broil them for 3 to 5 minutes. Keep an eye on them, because broilers move fast. This step gives the skin a little color and helps the sauce get sticky on top. It is optional, but I have to say, it makes the chicken look like you fussed over it.
Step 7: Spoon on the Sauce and Serve - Before serving, spoon that warm maple Dijon sauce from the slow cooker right over the chicken legs. Do not leave the good stuff behind. That sauce is the whole reason the rice, mashed potatoes, or roasted vegetables on the plate suddenly become everybody’s favorite part of dinner too.