Preheat oven to 450 degrees.
Place potatoes and onions in single layer on large baking sheet. Drizzle with oil and toss to coat thoroughly. Bake for 25-30 minutes, tossing occasionally, until onions are soft and potatoes are golden brown.
In large saucepan, heat 2 cups chicken broth, whipping cream, butter and salt until piping hot. Add roasted potatoes to saucepan and boil gently 15 minutes. Remove from heat. Using a hand-held emulsion blender, carefully puree the mixture until smooth and creamy. (Note: If you do not have an emulsion blender, you can transfer the mixture to a blender - in 2 or 3 batches - and blend until smooth; then return to the saucepan). Add remaining 1 1/2 cups of chicken broth and heat soup until piping hot. Serve as is, or top with a sprinkling of cheddar or Irish cheese and sliced green onions. If mixture is too thick, it may be thinned with additional chicken broth.
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Appetizing vegetable soups are healthy and delicious simple essentials to indulge in from time to time. Here is a recipe to make Roasted Potato Soup made by roasting potatoes before using them to make the soup. Great with cheese and green onions.
Oven Roasted Thick Dublin Potato Soup Recipe Video