Preheat oven to 350 degrees.
Whisk together the dry ingredients (oat flour through the salt) in a medium bowl.
In a liquid measuring cup, whisk the wet ingredients.
Pour the wet ingredients into the dry mix and blend and knead until a soft dough is formed. I use my hands to do this, a mixer would also work. You may add a couple tablespoons milk if it is necessary. Divide the dough in half.
Grease an 8 x 8 pan or line with parchment paper.
Place half the dough on a piece of parchment (or plastic wrap/non-stick baking mat/waxed paper), place another piece of parchment over the top, and roll it out into a rough 8 x 8 square.
Invert the rolled dough into the prepared pan, pressing and smooshing until the bottom crust is dispersed evenly. If you used parchment, you can set the whole piece with the dough right into the pan.
Gently remove the parchment (if you used it underneath, leave it there!)
Spread your jelly evenly over the bottom crust.
Roll out the top crust in the same manner as the bottom and flip over onto the top of the filling. Press and smoosh with the parchment in place and then remove when you are happy! I have also just moved pieces of the dough and overlapped pieces as a top crust…works great too, just doesn't look as pretty!
Bake for 20-25 minutes until the center is set.
Let cool completely to firm up and slice into desired shapes.
Store in an airtight container, or wrap each bar individually for storage in the freezer (helps to fill those lunchboxes quickly on harried mornings!)