Line an 8 × 8- inch pan with a large piece of parchment or wax paper (approximately double the size of the pan). Set aside.
Stir together the honey, 1/4 cup almond butter, and vanilla until smooth.
In a separate bowl, combine the oats, flax, protein, salt, and stevia. Add liquid mixture to dry ingredients. Stir to fully combine (mixture should quite dry/crumbly at this stage).
Transfer about 3/4 of the mixture to the pan (leaving behind the driest/crumbliest part). Press down very well, using the extra parchment paper to press it evenly into the bottom of the pan.
In a separate bowl, carefully melt the chocolate and 1/2 cup almond butter. Stir until smooth.
Pour the chocolate mixture evenly on top of the oatmeal layer in the pan.
Sprinkle the remaining oat crumbles on top of the chocolate layer. Gently press down using the parchment paper.
Freeze until firm enough to cut 3 x 3 (~1 hour).
Store in an airtight container in the freezer or fridge.