In a medium bowl, mash bananas with a fork really well. Add oats and stir to combine. Transfer onto prepared baking sheet and using spatula spread the dough in a thin layer. Take your time and make nice thin layer without gaps and holes.
Bake for 20 minutes or until golden edges and brown spots appear. Ovens and baking sheets vary. I used dark colour sheet, it might take longer in aluminum sheet. Just watch your crackers after 17 minute mark.
Remove from the oven and let cool for 5 minutes. Carefully peel of the parchment paper and place baked cracker crust on a cutting board. Using pizza cutter cut into desired crackers shape and size and place back on a baking sheet, crowding a bit is OK. Bake for another 5-7 minutes or until crispy.
Store: Store on a larger platter in a cool dark place uncovered. This way crackers stay crispy.
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