Prepare parchment-lined 8½ x 4½-inch (1.5 litre) loaf pan and set aside.
In a medium saucepan, combine peanut butter, maple syrup, protein powder, 1 tablespoon coconut oil and a pinch of sea salt and whisk together over low heat until melted and smooth.
Stir in Rice Krispies then transfer mixture to loaf pan, pressing it down and out into the corners to form a base. Let sit in the freezer for at least 20 minutes to cool and firm up.
While the base is setting, heat chocolate chips and 1 tablespoon coconut oil in the microwave at 30-second intervals until smooth, whisking in between, about 90 seconds total.
Remove loaf pan from freezer and spread chocolate evenly across the top. Sprinkle with flaky salt then let set in the fridge for 1 hour until hardened.
Slice into bars and store in an airtight container in the refrigerator for up to 2 weeks.