Begin by heating your saucepan over medium heat. Melt the butter and add the minced garlic, stirring until it's fragrant and starting to turn golden brown.
Add the cauliflower pieces into the saucepan with the garlic. Stir them together and let them cook for a few minutes.
Pour in the chicken broth, ensuring the cauliflower is covered. Let this mixture come to a gentle boil, then reduce the heat and simmer for 20 minutes.
Carefully transfer the soup mixture to a blender or use an immersion blender directly in the pan. Puree it until smooth and creamy.
Return the blended soup to the saucepan if necessary. Stir in the heavy cream and season with salt and pepper to your liking.
Notes
Store leftovers in the refrigerator for up to four days in an airtight container.