Bring a big pot of salted water to a rolling boil. Add the linguine and cook according to the package directions until al dente. Drain and set aside. Don't rinse—it helps the sauce stick better!
Heat olive oil in a large skillet over medium-high heat. Once hot, add the chicken in a single layer. Sprinkle it evenly with paprika, garlic salt, kosher salt, and pepper. Let it cook undisturbed for 3-4 minutes until golden brown on one side.
Nestle 2 tablespoons of cowboy butter into the pan. Flip the chicken pieces and cook for another 3-4 minutes or until fully cooked through (internal temp 165°F). Remove from the skillet and set aside, keeping them warm.
Reduce heat to low. Add the remaining cowboy butter, heavy cream, garlic salt, and crushed red pepper flakes to the skillet. Stir well and scrape up the browned bits—that's pure flavor gold! Simmer until the butter melts and the sauce comes together.
Add the cooked pasta and chicken back into the skillet. Toss everything gently to coat. Finally, pour in the lemon juice and give it one last stir.
Top with fresh lemon slices and a sprinkle of chopped parsley for that extra pop. Serve hot and enjoy every creamy, buttery bite!