Place the onion and bacon rashers into the Thermomix bowl and chop for 3 seconds, Speed 6.
Add the minced garlic and olive oil and sauté 4 minutes, 100 degrees, Speed 1.
Add the chopped chicken breast, chicken stock, boiling water, cream, and chopped tomatoes to the Thermomix bowl. Season with salt and pepper. Do not go past the 'fill' line.
Cook 5 minutes, 100 degrees, REVERSE, Speed 1. Place the steaming basket on the lid instead of the MC to stop splatters.
Add the pasta and cook for a further 15 minutes, 100 degrees, REVERSE, Speed 1. (The sauce will be quite thick).
Preheat oven to 200 degrees celsius (fan-forced).
Pour the pasta into a baking dish and stir through 300g frozen peas or corn.
Top with 1 cup grated cheese.
Bake in the preheated oven for 15 minutes or until golden.