Roast the beet. Wrap it into foil and place it into the preheated to 180°C oven for 30 minutes. Then take it out, let it cool for some minutes, peel and cut into random pieces.
Place the beet pieces in a blender or food processor. Add the cream cheese and blend until smooth and well combined. If the mixture is too thick, you can add a small amount of water or vegetable broth to thin it out.
Cook the pasta according to the package instructions until al dente. Drain and set aside.
Transfer the beet and cream cheese sauce to a skillet or saucepan. Heat over medium heat until warmed through. Season with salt to taste. Add the cooked pasta to the skillet with the sauce. Toss well to coat the pasta evenly with the creamy beet sauce.
In a separate small pan, lightly toast the chopped walnuts over medium heat for a few minutes until fragrant. Keep an eye on them to avoid burning.
Serve the pasta in individual bowls or on a platter. Top with the toasted walnuts, grated Parmesan cheese, and fresh mint leaves. Enjoy!