1 (7.25 ounce) package macaroni and cheese dinner mix (such as Kraft®)
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0.25 cup butter
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0.75 cup milk
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1 (10.5 ounce) can condensed cream of chicken soup
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1 (15 ounce) can sweet peas, drained
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1 (5 ounce) can chunk light tuna, drained and flaked
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1 cup shredded mild Cheddar cheese
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1.3333333730698 cups French-fried onions
Instructions
Preheat the oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking dish with nonstick spray.
Bring 6 cups water to a boil in a medium saucepan. Stir in macaroni from the box and cook for 7 minutes. Drain macaroni, then rinse under cold water and drain again. Set cheese sauce packet aside.
Melt butter in the same saucepan over medium heat. Add milk and cheese sauce packet; mix well. Stir in condensed soup and cook until heated through, about 3 minutes.
Combine drained macaroni, peas, and tuna in a bowl. Fold in the cheesy soup mixture. Pour mixture into the prepared baking dish.
Bake in the preheated oven for 30 minutes. Sprinkle with Cheddar cheese, then sprinkle French-fried onions over top. Bake until onions are brown and cheese is melted, another 5 minutes.