Line a 9x9 inch metal baking pan with parchment or waxed paper. (Metal has even corners and straighter sides than glass or ceramic, which makes your bars more even).
In a food processor, combine the flaked coconut, sliced almonds, pecans, and pumpkin seeds. Pulse until they resemble oat flakes with a few larger pieces.
Transfer to a bowl and add the protein powder, sweetener, and salt. Stir until well combined.
Add the peanut butter, honey, and vanilla. Stir until the mixture begins to hold together. Add water 1 tablespoon at a time, as necessary, to help the dough cling together. It should feel like thick cookie dough.
Press the mixture firmly and evenly into a 9x9 metal baking pan lined with parchment or waxed paper. Chill 2 to 3 hours until firm, and then cut into bars or squares with a sharp knife.
