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Stella’s Chicken Casserole

Stella’s Chicken Casserole

If you are searching for a flavor-packed chicken casserole that isn’t heavy or bland, Stella’s Chicken Casserole delivers. This oven-baked dish combines tender chicken, fresh vegetables, and a vibrant herb dressing inspired by Chimichurri. The result is juicy, garlicky, slightly tangy, and perfectly balanced—never soupy, never dry.
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Prep Time 20 minutes
Cook Time 40 minutes
Total Time 1 hour
Servings: 6
Course: Main Course, Side Dish
Cuisine: Argentine / South American
Calories: 350
Ingredients Equipment Method Notes

Ingredients
  

  • 1.5 pounds Boneless chicken thighs or breasts
  • 2 cups Mixed vegetables (like bell peppers, zucchini, onions)
  • 1 cup Fresh parsley leaves
  • 4 cloves Garlic
  • 1/4 cup Red wine vinegar
  • 1/2 cup Olive oil
  • 1/2 teaspoon Red pepper flakes
  • 1/2 cup Grated Parmesan cheese
  • To taste - Salt and black pepper
  • 1 teaspoon Dried oregano

Equipment

  • 1 Baking dish (9x13 inch)
  • 1 Blender or food processor
  • 1 Cutting board
  • 1 Sharp knife
  • 1 Mixing bowl

Method
 

Step 1: Prepare the Dressing
  1. Start by making the dressing, which is the heart of this casserole. In a blender or food processor, combine the parsley, garlic, oregano, red pepper flakes, vinegar, olive oil, salt, and pepper. Blend until mostly smooth but with some texture—about 30 seconds. Stir in the grated Parmesan by hand to keep it from getting too gummy. Taste and adjust seasoning; I always add a bit more vinegar if it needs zing.
    Step 1: Prepare the Dressing
Step 2: Prep the Chicken and Veggies
  1. Chop your chicken into 1-inch pieces and season lightly with salt and pepper. Dice the vegetables into similar sizes for even cooking. In a mixing bowl, toss half the dressing with the chicken and veggies to coat everything well. Let it sit for 10 minutes if you have time—it helps the flavors soak in. Pro tip: I do this while preheating the oven to 375°F (190°C) to save time.
    Step 2: Prep the Chicken and Veggies
Step 3: Assemble the Casserole
  1. Transfer the dressed chicken and veggie mixture to your baking dish. Spread it out evenly, then drizzle the remaining dressing over the top for extra moisture. Sprinkle a little more Parmesan if you like a cheesy crust. I find this step is where the magic happens—the aromas start building even before baking.
    Step 3: Assemble the Casserole
Step 4: Bake and Serve
  1. Bake in the preheated oven for 35-40 minutes, until the chicken is cooked through (internal temp 165°F) and the top is bubbly and golden. Let it rest for 5 minutes before serving—this lets the juices settle. I love serving it hot with a side of crusty bread.
    Step 4: Bake and Serve

Notes

  • Salt Control: Taste as you go—the cheese adds saltiness, so start low and build up.
  • Oil Quality: Use good olive oil; it really shines through in the flavor.
  • Resting Time: Let the assembled casserole sit for a few minutes before baking to meld flavors.
  • Re-whisking Before Serving: If the dressing separates after sitting, give it a quick stir—it's natural and easy to fix.