Preheat the oven to 300F and line a 9"x9" baking sheet with parchment paper, letting the paper overhang on two sides.
Add oats, almond flour, cacao powder, maple syrup, and almond butter to a food processor and process until sticky and small balls start to form. Use a spatula to scrape down the sides a couple of times (turn the processor OFF when scraping).
Add oat crumble to the baking pan and press down firmly with a flat-bottom glass and spatula to compress well.
Bake for 15 minutes, then place on a wire rack to cool.
In the meantime, melt chocolate and coconut oil in the microwave in 10-second intervals stirring in-between, or over a water bath stirring constantly.
Pour the melted chocolate over the oat mix and move the baking pan around to ensure the chocolate covers all the oats.
Sprinkle sliced almonds on top and then place in the fridge for one hour.
Cut into 12 evenly sized pieces and store in the fridge for up to 1 week.