Line an 8x8-inch baking pan or container with parchment paper.
In a large bowl, combine the almond flour, peanut butter, and maple syrup. Mix until a thick, uniform mixture forms.
Transfer the mixture to the prepared pan and press it down firmly into an even layer.
Place in the refrigerator for 30 minutes, or until the base has firmed up.
Melt the semi-sweet chocolate in the microwave in 20-second intervals or using a double boiler, stirring until smooth.
Pour the melted chocolate over the chilled peanut butter layer and spread evenly with a spatula.
Sprinkle with flaky sea salt.
Return to the refrigerator for another 20–30 minutes, or until the chocolate is fully set.
Slice into bars or squares and enjoy.