In a small saucepan, combine brown rice syrup, 1/4 cup peanut butter and pinch of sea salt over low heat. Allow mixture to melt, stirring often.

Pour cereal into a large bowl. Once brown rice syrup mixture is smooth and warm, remove it from heat and pour on top of the cereal. Stir with a wooden spoon until evenly combined.

Line a square 8x8 pan with tin foil. Pour the cereal into the pan, pressing down firmly.

Combine the dark chocolate chips, remaining peanut butter, milk, and vanilla in the same small saucepan. Warm over low heat, stirring often until melted and smooth.

Pour the chocolate mixture evenly over the brown rice crisps cereal.

Refrigerate the brown rice crispy treats until the chocolate is firm and hardened (at least 90 minutes).

Cut the treats into squares, and keep in a cool place until ready to be enjoyed.