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Prepare Oven and Skillet: Preheat the oven to 350 degrees Fahrenheit. Heat olive oil in a large skillet over medium heat.
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Brown the Beef: Add ground beef and chopped onion to the skillet. Cook for about 8-10 minutes until the beef is well-browned and onions are translucent. Season with salt and pepper.
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Enhance Flavors: Stir in tomato paste, garlic, Italian seasoning, celery salt, and drained diced tomatoes with chilies. Cook for another 5 minutes, stirring frequently.
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Cook Noodles: In a large pot of boiling water, cook egg noodles for 3 minutes. Reserve 2 cups of noodle water, then drain.
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Make Cream Mixture: In a mixing bowl, combine sour cream, cream cheese, cornstarch, and 1/2 cup reserved noodle water. Whisk until smooth.
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Combine Ingredients: Add partially cooked noodles and remaining noodle water back into the pot. Transfer to a greased 9×13 inch baking dish. Adjust seasoning with salt and pepper.
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Assemble Casserole: Spread beef mixture evenly over noodles. Smooth with the back of a spoon.
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Bake: Top with shredded Colby Jack cheese. Bake in the preheated oven for 25-30 minutes, until cheese is bubbly and slightly browned.
