Pear and Cranberry Crisp

old-fashioned rolled oats (not quick-cooking)

plus 2 tablespoons packed light-brown sugar

all-purpose flour (spooned and leveled)

blanched almonds, chopped

ground cinnamon

fine salt

unsalted butter, room temperature

pears, such as Bartlett or Anjou (about 6), cored, peeled, and cut into 1/2-inch pieces

finely chopped crystallized ginger (optional)

dried cranberries

cornstarch