First, marinate your chicken with salt, pepper, soy sauce, garlic, and tomato paste in a bowl. While the chicken marinates, start cooking your pasta to al dente. Once your chicken has marinated for 10 minutes, start searing it off in a pan with a bit of oil. Throw in your onion and sear that off a little. Once the chicken has a nice sear on it, throw in your heavy cream with your peas and bring that to a slight boil. Now, throw in your Parmesan and let the sauce thicken up. If the sauce is still not thick enough, throw in more Parmesan until it thickens. Once your sauce is thick enough, start plating your food and top it off with some more Parmesan.