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Oven Preparation: Begin by preheating the oven to a temperature of 375°F. Subsequently, ensure that a 2-quart baking dish is lightly coated with cooking spray.
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Meat Preparation: In a pan, brown the ground beef on a medium flame until its color predominantly shifts from pink. Subsequently, introduce the finely chopped onions to the pan and sauté for a duration of 3-4 minutes or until the onions become translucent. Following this, incorporate the taco seasoning along with the water, ensuring a consistent mix. Allow this mixture to simmer for a few minutes until it achieves a slightly thickened consistency.
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Sauce Incorporation: Following the above, introduce the tomatillo salsa and sour cream into the pan. Ensure a consistent stir. Sequentially add the black beans and corn, ensuring a uniform distribution within the mixture. Once done, remove the pan from the heat.
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Casserole Assembly: Crush half of the Frito corn chips to a coarse consistency and evenly distribute them at the base of the previously prepared baking dish. This should form a complete layer. Once this base is set, evenly layer the previously prepared taco meat mixture over it. This should be followed by an even sprinkling of the Mexican-blend cheese. Conclude this layering by topping the casserole with the remaining corn chips.
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Baking: Cover the baking dish and place it in the oven. Allow it to bake for a duration of 15-20 minutes or until noticeable bubbling occurs and the cheese achieves a fully melted state. Following this, uncover the casserole and allow it to bake for an additional 5 minutes. Once done, remove from the oven.
