Creamy Potato Soup

This is the first recipe that I came up with on my own, and it turned out really good, if I don't say so myself. I wanted to try a potato soup but couldn't find a recipe I liked, so I tried making this using flavors that I like. It almost reminds me of a mix between soup and mashed potatoes.

1 T butter
1 T olive oil
1 small white onion, diced
2 cloves garlic, minced
3 russett potatoes, cut into 1/2-inch pieced
3 cups chicken stock
1/2 tsp pepper
1 tsp. salt
1/4 cup heavy cream

In a large pot, heat butter and olive oil. Add onion and saute until translucent, about 5 minutes. Add garlic and cook for about a minute. Add potatoes, chicken stock and salt and pepper. Bring to a simmer and cook for about 20 minutes, or until potatoes are very soft. With an immersion blender (or in batches in a blender), puree the soup. (If using a blender, return to pot.) Add heavy cream and heat through.