Heat spray oil in a pan over medium-high heat. Add chopped onions, chicken, and garlic granules. Cook for about 5 minutes until chicken is browned and onions are softened.
Pour in chicken stock and simmer. Add mushrooms and simmer for 15 minutes.
Prepare breadcrumb topping by blending bread into crumbs. Mix in cheese and mustard powder.
Cook spaghetti separately. Add cooked spaghetti to the chicken mixture along with spinach. Stir in reduced-fat soft cheese until well combined.
Season with salt and pepper. Preheat oven to 240°C (220°C fan).
Transfer the mixture to a baking dish. Sprinkle the breadcrumb topping evenly over the top.
Bake in the preheated oven for 20 minutes or until golden brown.
Serve hot and enjoy the lighter version of Chicken Tetrazzini.
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