Bake the russet potatoes at 400°F (200°C) for about 1 hour until tender.
Once cooled, peel and dice the potatoes into small chunks.
In a large pot, melt the butter over medium heat.
Add the chopped onion and sauté until translucent, about 5 minutes.
Stir in the diced potatoes and chicken broth, bringing to a simmer.
Use a potato masher to mash some of the potatoes for a creamy texture.
Pour in the heavy cream and stir until well combined.
Add the shredded cheddar cheese, stirring until melted and smooth.
Season with salt and pepper to taste.
Serve hot, garnished with crumbled bacon and chives.