Break the spaghetti noodles in half and place them in a microwave-safe container.
Add heavy cream, milk, minced garlic, and salt, then mix well.
Pour in enough water to cover the ingredients.
Microwave for 7–8 minutes.
Finely chop the bacon and onion, add them in, and microwave for another 2 minutes.
Open the lid, stir well, and add cheese and black pepper.