Cook bacon in large skillet over medium heat until brown and crisp. Using slotted spoon, transfer bacon to paper towels to drain. Transfer 2 tablespoons bacon drippings to blender; add milk and next 3 ingredients, then 1 cup chestnuts. Blend until batter is smooth. Pour batter into bowl; stir in remaining 1/2 cup chestnuts.
Pour remaining drippings into small bowl. Brush same skillet with some drippings; heat over medium heat. Drop in batter by rounded tablespoonfuls. Cook pancakes until brown and cooked through, about 3 minutes per side. Transfer to plates. Top with créme fraîche and bacon, then chives or maple syrup.
