In a large stew pot or Dutch oven, place the onion, garlic, and 1 ½ cups of the vegetable stock. Cover the pot and bring to a boil over high heat. Reduce the heat to low and simmer, covered, until the onion is translucent, about 10 minutes.
Add the corn, potato, and 4 ½ cups of the remaining stock. Bring to a boil over medium heat. Reduce the heat and simmer until the potato is soft, 10 to 15 minutes.
Transfer half of the mixture to a blender and blend until smooth. Return to the pot. Add up to 1 cup stock to adjust the consistency if necessary.
Add the bell pepper, parsley, and thyme. Bring to a simmer and cook for another 10 minutes, until the flavors have blended and the pepper is tender.
Meanwhile, place the flour and ⅓ cup water in the blender and blend until smooth. Stir the almond cream into the chowder. Add salt and pepper to taste. Serve hot.
