Begin by dicing the potatoes into bite-sized pieces and boiling them until they're tender. Once cooked, set them aside for later use.

In a large pot, combine the broth, diced onions, salt, pepper, and water. Bring the mixture to a gentle simmer over medium heat and allow it to cook for about 20 minutes, ensuring the flavors meld together.

Slowly incorporate the roux into the simmering broth, whisking continuously to prevent lumps from forming. This will help thicken the soup and give it a creamy consistency.

Allow the soup to simmer for an additional 20 minutes, stirring occasionally to ensure it doesn't stick to the bottom of the pot. This gives the flavors a chance to meld together beautifully.

Once the soup has simmered and thickened to your liking, gently add the diced potatoes. Stir well to distribute them evenly throughout the soup.

Ladle the soup into bowls and garnish each serving with a generous sprinkle of Colby-Monterey Jack cheese, crispy bacon bits, and finely chopped green onions. These toppings add both flavor and visual appeal to the dish.

Serve the soup hot and enjoy the comforting flavors of this creamy potato soup with its delightful garnishes.