Preheat the oven to 350 degrees Fahrenheit. This step ensures that your oven is nice and hot when you're ready to bake the casserole.
Take your baking dish and pour the melted butter into it. Make sure to spread the butter evenly across the bottom of the dish. You can use a brush or the back of a spoon to help with this.
Sprinkle the shredded chicken evenly over the melted butter.
Layer the frozen peas and carrots on top of the chicken.
In a separate bowl, mix together the cheddar bay biscuit mix, the seasoning packet, and those flavorful garlic, pepper, salt, and oregano seasonings. This mixture will add a burst of deliciousness to your casserole.
Add the milk to your seasoning mix and give it a good stir. You can use a fork or a whisk for this step. It's like creating a creamy sauce that will soak into the biscuits.
Add the cheese to your biscuit mixture and stir it all together.
Now, pour this biscuit batter evenly over the chicken and veggies. It's like adding a fluffy biscuit layer to your casserole.
Mix the cream of chicken soup and chicken broth together in another bowl until they're well combined. This creates a creamy sauce that will make your casserole extra comforting.
To finish the casserole, pour this creamy soup mixture evenly on top of everything in the baking dish.
It's important not to stir anything together at this point. Let all the layers stay as they are. They'll come together beautifully while baking.
Carefully place your casserole in the oven and let it bake for about 45 minutes.
Once it's out of the oven, allow it to cool for a few minutes. Enjoy this warm and comforting chicken and biscuit casserole!