Place sour cream, Neufchatel, and spices in a large bowl and mix well until combined thoroughly. Spread mixture in a pie dish, cover with plastic wrap, and refrigerate at least 4 hours or overnight.
Spread salsa layer over mixture in pie dish. Sprinkle shredded cheddar over salsa layer in pie dish. Spread peppers over cheddar layer in pie dish. Sprinkle scallions on top.
Serve with cut up vegetables and tortilla chips for an appetizer or alongside corn tortillas, beans, and brown rice for a full meal.