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 saute 4 minutes, 100 degrees, Speed 1.
Add the chopped chicken breast, chicken stock, boiling water, cream, chopped tomatoes to the Thermomix bowl. Season with salt and pepper. Do not go past the 'fill' line.
Cook 5 minutes, Reverse Speed 1, 100 degrees (no MC but place the rice basket over the top to stop splatters).
Add the pasta and cook for a further 15 minutes, Reverse, Speed 1, 100 degrees (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 200 degrees (fan-forced), 15 minutes or until golden.