Combine the butter, both sugars, eggs and vanilla in a bowl. Mix well.
Add in the flour, cocoa and salt and mix until just combined.
Fold in the peanut butter chips.
Pour into and 8x8 pan and bake at 350 for 20-25 minutes
While they bake make the glazes:
For the chocolate glaze whisk together the icing sugar, butter, cocoa, vanilla, salt and boiling water. Whisk until smooth.
For the peanut butter glaze whisk together the icing sugar, peanut butter, salt, peanut butter powder (if using) and boiling water. Whisk until smooth.
When the brownies come out spread the chocolate glaze evenly over them and let sit for a few minutes. Then drizzle with the peanut butter glaze.