Heat oil in 6-quart stock pot on medium-low heat until hot; add leek. Cook 4 to 6 minutes, stirring occasionally until softened. Add potatoes and broth; bring to a boil. Reduce heat to medium-low; cover and simmer 20 minutes, or until potato is tender. Remove from heat.
Add 2 cups potato mixture to blender container. Pulse on and off until smooth. Roughly mash remaining potato mixture in stock pot for chunky consistency; combine with blended mixture in same pot. Add corn, cream, paprika and prepared beef Brisket. Season with salt and pepper, as desired. Cook 5 to 10 minutes or until heated through. Garnish with cheese, cilantro, lime, hot sauce and avocado, as desired.