This healthy soup can be made in 15 minutes from start to finish and has only 9 ingredients. It's creamy deliciousness will make this a favorite on my comfort food list.
Heat the oil in a Dutch oven over medium-high heat until hot but not smoking. Add the asparagus, onion, and garlic. Season with salt and pepper. Sauté for 5 minutes or until the onions and asparagus are soft.
Add the milk, broth, and collagen, if using. Bring to a boil; then reduce the heat to maintain a simmer for about 5 minutes.
Remove the pot from the heat and blend with an immersion blender. If you don't have an immersion blender, you can transfer it to a blender. Blend until it is smooth or to your desired texture.
For leftovers or meal prep, store in an airtight container (preferably glass) for up to 4 days in the refrigerator or 3 months in the freezer.