Mustard-Glazed Chicken with Onions and Thyme

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

Chicken thighs coated in a tangy mustard glaze, roasted with caramelized onions and thyme for savory depth. This French-inspired chicken recipe (whole30, dairy-free), ready in about 45 minutes, pairs boneless chicken thighs, Dijon mustard, apple cider vinegar for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 295 calories and feeds 4, so it slots cleanly into a Whole30 week and pairs well with roasted sweet potato or a simple olive-oil salad. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Prep: 15 min Cook: 30 min Serves 4 French cuisine 295 cal/serving
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Ingredients

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Instructions

  1. Step 1: Preheat oven to 375°F. In a small bowl, whisk 3 tbsp Dijon mustard, 2 tbsp apple cider vinegar, and 1 tbsp olive oil until smooth.
  2. Step 2: Pat chicken thighs dry and place in a baking dish. Season with 1 tsp dried thyme, 1/2 tsp sea salt, and 1/4 tsp black pepper.
  3. Step 3: Pour mustard mixture evenly over chicken, then arrange 1 medium thinly sliced yellow onion around the chicken. Bake for 28-32 minutes until chicken reaches 165°F and onions are tender and golden.

Frequently asked questions

How long does Mustard-Glazed Chicken with Onions and Thyme take to make?

Total time is about 45 minutes (15 min prep + 30 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.

How do I store leftover Mustard-Glazed Chicken with Onions and Thyme?

Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep boneless chicken thighs from drying out.

Can I substitute ingredients in Mustard-Glazed Chicken with Onions and Thyme?

Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.

How do I scale Mustard-Glazed Chicken with Onions and Thyme for a different number of people?

The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.

Is Mustard-Glazed Chicken with Onions and Thyme whole30?

Yes — this recipe is tagged whole30, dairy-free, gluten-free based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.

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