Line an 8x4 inch loaf pan with parchment paper, leaving an overhang on the sides.
In a large mixing bowl, whisk together the vanilla protein powder, coconut flour, and salt until well combined.
Add the cashew butter, honey, vanilla extract, and almond extract to the dry mixture.
Stir the mixture while gradually adding almond milk one tablespoon at a time until a thick, pliable dough forms.
Fold in 2 tablespoons of the rainbow sprinkles.
Transfer the dough to the prepared pan and press down firmly using a spatula to create an even layer.
Drizzle the melted white chocolate over the top and immediately top with the remaining 1 tablespoon of sprinkles.
Place the pan in the refrigerator for at least 30 minutes to allow the bars to firm up.
Lift the parchment paper out of the pan and slice the block into 8 equal bars.