In a mixing bowl, combine 1 tsp salt, 1 tsp black pepper, 1 tsp garlic powder, 1 tsp onion powder, and 1 tsp paprika.
Add 8 boneless chicken thighs to the bowl, drizzle with approximately 4 tablespoons of olive oil and 1 tablespoon of vinegar.
Mix thoroughly to ensure the chicken is evenly coated with the seasoning. Let it sit for at least 10 minutes to absorb the flavors.
Heat a large skillet over medium-high heat. Add the seasoned chicken thighs and cook for about 4 minutes on each side until they develop a golden-brown crust and are fully cooked through.
Remove the cooked chicken from the skillet and let it cool slightly. Using a stand mixer or hand mixer, shred the chicken until it reaches your desired consistency. Set aside.
Bring a large pot of salted water to a boil. Add 12 lasagna noodles and cook according to package instructions until al dente. Drain and rinse with cool water to prevent sticking. Lay the noodles flat to cool.
Preheat your oven to 375°F (190°C). Line a baking sheet with aluminum foil for easy cleanup. Arrange 8 slices of bacon in a single layer on the baking sheet. Bake for 15 minutes or until crispy. Remove from the oven, let cool, then crumble or chop into small pieces.
In a saucepan, melt 4 tablespoons of butter over medium heat. Add 2 cloves of minced garlic and 1/2 diced red onion. Sauté until the onions are translucent and the garlic is fragrant, about 5 minutes.
Sprinkle in 4 tablespoons of flour, stirring continuously to form a smooth paste. Cook for 1-2 minutes to eliminate the raw flour taste. Stir in 1 tablespoon of Dijon mustard.
Gradually whisk in 4 cups of whole milk, ensuring there are no lumps. Add 1/4 cup of ranch seasoning and 1 tablespoon of chicken bouillon seasoning (optional). Continue to cook, stirring frequently, until the sauce thickens, about 5-7 minutes.
Lower the heat and stir in 8 oz of cream cheese until melted and smooth. Add 16 oz of sharp cheddar cheese and 8 oz of mozzarella cheese, stirring until fully melted and the sauce is creamy. Season with additional salt and pepper to taste.
Grease a large baking dish. Spread a thin layer of the cheese sauce on the bottom. Place three lasagna noodles over the sauce. Spread half of the shredded chicken and crumbled bacon evenly over the noodles.
Spoon another layer of cheese sauce over the chicken and bacon. Sprinkle a portion of the shredded sharp cheddar and mozzarella cheese on top.
Add another layer of three lasagna noodles, followed by the remaining shredded chicken and bacon. Top with the final three lasagna noodles.
Pour the remaining cheese sauce over the top layer of noodles. Sprinkle 1/4 cup of grated Parmesan cheese and additional mozzarella cheese as desired.
Preheat your oven to 375°F (190°C) if not already done.
Cover the baking dish with aluminum foil and bake for 30 minutes. Remove the foil and bake for an additional 15 minutes or until the top is golden and bubbly.
Allow the lasagna to rest for about 10 minutes before serving to set the layers and make slicing easier.
Sprinkle chopped scallions and parsley over the top for added flavor and a pop of color.
Cut into portions and serve warm. Enjoy your delicious Crack Chicken Lasagna!