Bring a large pot of salted water to boil. Dice the potatoes, carrot, and bell pepper. Add to the boiling water and cook until just tender, about 10 minutes. Drain and let cool.
Place the potatoes, carrot, bell pepper, cashews, garlic, nutritional yeast, oil, onion powder, and milk in a food processor and blend until smooth. Return to the pot and bring to a bri