In a food processor add the cashews and almonds and process until they are a coarse powder.
In a small saucepan over low heat combine the maple syrup and almond butter and melt together.
Remove saucepan from heat and add the vanilla and cinnamon. Stir to combine.
In a medium mixing bowl combine the melted maple syrup mixture and the ground up nuts from the food processor. Mix them together.
Add the puffed rice to the bowl. Stir to combine.
In a 8 inch square pyrex dish (prepare it with a little coconut oil or butter first so the bars don't stick) pour in the bar mixture and press down with greased hands or a greased piece of parchment paper to flatten the mixture. The mixture won't cover the entire pan most likely, but flatten them out as much as you can.
Stick dish in freezer for 30 minutes. This will set the bars. After 30 minutes take the bars out and cut them into the bar size you want (we did them in a rectangle like the photo shows) and wrap them individually in parchment paper. I put all the bars into a gallon freezer bag and keep in the freezer. When my kids want a bar they simply pull an individual bar out of the bag and we take it with us. They can be eaten frozen (not too hard at all) or room temp (they will crumble more at room temp but they still hold together). My kids much prefer them frozen.