Cook onion in skillet with oil on medium-high for about 3 minutes, stirring. Add carrots and cook until carrots are fork tender and onions golden, about 7 min.
Next, add garlic and cook for one minute.
Add cooked veggies, along with remains ingredients, to a high-speed blender and blend on the heat/soup setting until silky smooth. If you don't have a heat setting on your blender, put it back in the skillet once it's blended and gently heat to desired temperature (or put it in a fondue pot!).