Start by lining an 8x8 inch square baking pan with parchment paper, leaving some overhang on the sides to make it easier to lift the bars out later.
In a large mixing bowl, combine the rolled oats, rice crispies, shredded coconut, sliced almonds, and salt. Stir until everything is evenly distributed.
In a separate bowl, mix together the almond butter, honey, instant coffee, and vanilla extract until smooth and well combined.
Pour the wet mixture into the dry ingredients, and mix thoroughly until everything is coated. The mixture should be sticky and hold together.
Melt the dark chocolate chips using a double boiler or microwave, then pour the melted chocolate into the granola mixture. Stir until the chocolate is fully incorporated.
Gently fold the popped popcorn into the granola mixture, being careful not to crush the popcorn.
Transfer the mixture to your prepared baking pan. Use a spatula or your hands to press it down firmly and evenly.
Melt the white chocolate and drizzle it over the pressed mixture in the pan. You can also melt some additional dark chocolate and drizzle that on top as well.
Place the pan in the refrigerator for about 1-2 hours, or until the mixture has set firmly.
Once set, lift the granola mixture out of the pan using the parchment paper. Cut into bars or squares, and sprinkle a little sea salt on top if desired.