Mustard Free Dairy Free Chicken Casserole

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  2 lbs boneless, skinless chicken breasts, cut into 1-inch pieces
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  ½ tsp salt
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  ¼ tsp black pepper
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  3 tbsp olive oil, divided
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  Ingredients can vary. These products likely fit a Mustard Free diet.

  Filippo Berio Olive Oil 25.3 fl ozFilippo Berio Olive Oil 50.7 fl ozBertolli Cooking Olive Oil 50.72 ozPompeian Olive Oil Classic Mediterranean - 16 Fl. Oz.Vigo® 100% Pure Olive Oil

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  1 medium yellow onion, diced
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  3 medium carrots, peeled and sliced into ¼-inch rounds
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  3 stalks celery, sliced
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  3 cloves garlic, minced
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  1 tsp dried thyme
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  ½ tsp dried rosemary
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  1 cup frozen peas

For the sauce

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  3 tbsp all-purpose flour
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  2 cups low-sodium chicken broth
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  1 cup dairy free milk
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For the topping

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  1 cup dairy free breadcrumbs
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  2 tbsp olive oil
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For serving

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  2 tbsp fresh parsley, chopped (optional)