Bring a large pot of water to a boil, and salt generously. Add the pasta, and boil according to package directions until al dente, tender but still slightly firm. Strain, and toss with a splash of oil.

Meanwhile, slice the chicken into 1/4-inch-thick bites, and lay them on a plate or a sheet of waxed paper. Season with salt and pepper.

Heat a large skillet over medium heat, and add 2 tablespoons of the butter. When the butter melts, raise the heat to medium-high and add the chicken in 1 layer. Cook, without moving the pieces, until the underside has browned, 1 to 2 minutes. Flip the pieces, and cook until browned and fully cooked through, 2 to 3 minutes more. Transfer the chicken to a medium bowl.

Reduce the heat to medium, and add the remaining 6 tablespoons butter. Scrape the bottom of the skillet with a wooden spoon to release any browned bits. When the butter has mostly melted, whisk in the cream and garlic and bring to a simmer, then cook for 2 minutes. Lower the heat to keep the sauce just warm.

Whisk the Parmigiano-Reggiano into the sauce. Add the chicken and cooked pasta, and toss well. Season with salt and pepper. Serve hot in heated bowls.