In a small bowl, smash ¾ cup of the beans with the back of a fork to create a thick paste.
Set aside.
Heat the olive oil in a large pot or Dutch oven over medium heat.
Add the chopped bell pepper and sliced onion, season with salt and pepper, and cook for 5 minutes, stirring occasionally, until softened.
Add the sliced potatoes and continue to cook for 10 minutes, or until they begin to turn tender.
Stir in the minced garlic and cook for 1-2 minutes more, until fragrant.
Pour in the vegetable broth, 1 cup (240 ml) of water, the smashed bean paste, the remaining whole beans, and the ground nutmeg.
Stir everything together and bring the soup to a boil.
Reduce the heat to medium-low, cover partially, and let it simmer for 12 to 15 minutes to allow the flavors to meld together.
Stir in the torn Swiss chard leaves.
Season with additional salt and pepper to taste, and continue to simmer for 5 more minutes, or until the chard is wilted and tender.