Mix the maple syrup and coconut oil together in a medium saucepan over medium heat. Bring it to a boil, stirring carefully until it is mixed well and just starting to bubble.
Let the mixture boil for 3 full minutes, until it is reduced by one-third, stirring occasionally. Add 1/2 teaspoon of the flaky salt and sliced almonds. Stir to combine.
Spread the coated almonds onto the prepared baking sheet, spreading them out as much as possible. Let dry completely. Have another parchment-lined baking sheet ready.
Add chopped chocolate to a heatproof bowl set over a pot of simmering water. Do this until the chocolate is almost melted, then remove from the heat and stir until melted and smooth.
Fold 2/3 of the candied almonds in the melted dark chocolate mixture, then spread it flat onto the parchment paper. It should be about 1/4-inch thick.
Scatter the rest of the candied almonds over the top. Sprinkle the remaining salt over the chocolate.
Let the chocolate bark harden either in the fridge or freezer. Since it's all one single layer, you can use an offset spatula to break it into small pieces, making it easy to pick up and eat. Do your best to break it into 12 to 15 evenly sized pieces.