Preheat oven to 350 degrees. Spray your loaf tins with cooking spray. Line with parchment paper if you are concerned with removing them from the pan.
Mix the milk, sugar and yogurt in a bowl.
Mix the flour and cranberries in a separate bowl. Stir it up so the cranberries are coated.
Add the remaining ingredients to the dry mix. Stir to mix evenly and then stir in the milk mixture. Don't over mix. (It should look similar to a muffin batter).
Divide batter evenly among your loaf pans. Bake 25-30 minutes until a toothpick in the middle comes out clean.
Cool on a rack. When completely cool wrap in plastic wrap and freeze. Freeze at least 2 hours or up to 3 months.
Remove loaves from freezer at least 90 minutes before serving. Defrost loaves about 20-30 minutes before you slice them. (They are easier to cut very thinly if semi-frozen).
Preheat oven to 250 degrees. Line 2 baking sheets with parchment paper.
Separate oven racks to lower and middle of the oven.
Using a very sharp, serrate bread knife slice loaves into thin slices about ¼ inch thick. (Err on the thin side of slicing rather than thicker.)
Arrange slices on the baking sheets. They will not change shape so you can pack them closely together.
Bake for 50 minutes, switching the trays half way through.
Crackers should be golden brown when done baking. Allow crackers to cool on the trays. They will harden as they cool.
Store in an airtight container for up to four weeks.