Set up the non-chicken ingredients first. Weigh the pasta and peas, measure the cream, grate the Parmesan, and chop the onion and garlic before opening the chicken. This keeps the raw-poultry stage short and prevents chicken-covered hands from reaching for packets and drawer handles.
Use a genuinely separate board for the chicken and do not wash the meat. An adult can cut it into small, similar pieces, move it straight to the pan and then wash hands with soap while the child stays with the prepared ingredients. Clean the board, knife and any contaminated surface before cooked food comes near them.
Cook the pasta to the packet time, but make reserving water part of the draining routine. Put a heatproof mug beside the hob before cooking so nobody remembers at the last second. The cloudy water contains starch that loosens the sauce while helping it stay attached to the pasta.
Give the chicken space in the pan and turn the pieces rather than stirring constantly. Cook until browned, then inspect a thick piece for a steaming, non-pink centre before the sauce goes in. Once cream coats the chicken, visual checking becomes harder, so this checkpoint matters.
Turn the heat down for cream and Parmesan. A quiet simmer for the card's 2 to 3 minutes heats the peas and melts the cheese without aggressively boiling the sauce. Stir across the bottom and into the corners so Parmesan cannot collect and catch.
Add pasta water in small splashes after the pasta goes in. The sauce should look slightly looser than perfect while still in the pan, because hot pasta absorbs more on the way to the table. Serve promptly and let each child's portion cool before eating.