Combine oats, flour, brown sugar, baking powder, baking soda, and salt in a large mixing bowl. Mix well and break up any clumps.
Add beaten eggs and melted butter to the bowl. Mix well until the eggs and butter are soaked up by the mixture.
Prepare a buttered 11 x 8.5 inch (2 quart) baking dish. Spread about 2/3 of the mixture along the bottom of the baking dish, pressing down flat. Then spread cranberry sauce as the middle layer. Lastly, spread the remaining 1/3 of the mixture as the top layer.
Bake at 350 F for 30 minutes. Let cool and cut into bars.