2 tablespoons olive oil
4 skinless, boneless chicken breasts, cubed
1 tablespoon lemon-pepper seasoning
1 (16 ounce) container fat-free sour cream
1 (10.75 ounce) can condensed cream of chicken soup
1 cup milk
1 (1 ounce) package ranch dressing mix (such as Lipton® Recipe Secrets®)
1 ½ cups shredded Colby-Monterey Jack cheese
2 green onions, diced
Preheat the oven to 350 degrees F (175 degrees C).
Fill a large pot with lightly salted water and bring to a rapid boil. Cook egg noodles at a boil until tender yet firm to the bite, 7 to 9 minutes.
Meanwhile, place bacon in a large skillet and cook over medium-high heat, turning occasionally, until evenly browned, about 10 minutes. Drain bacon slices on paper towels. Crumble.
Heat oil in a skillet over medium-high heat. Place chicken in the hot skillet, sprinkle with lemon-pepper, and brown on all sides, 5 to 7 minutes. Remove with a slotted spoon and place in a 9x13-inch baking dish.
Combine 1/2 of the crumbled bacon, sour cream, soup, milk, and ranch dressing mix in a bowl and mix until blended. Pour over chicken, add drained egg noodles, and stir. Sprinkle remaining bacon on top, cover with Colby-Jack cheese, and top with green onions.
Bake in the preheated oven until cheese is melted and chicken is no longer pink in the center, about 30 minutes.