• Melt butter in microwave and set aside to cool slightly.
• Sift together all dry ingredients in a large bowl.
• In a medium bowl, beat the eggs with the vanilla. Add into the dry ingredients and gently stir.
• Pour the melted butter into brownie mixture and mix until just incorporated.
• Spread 1/2 of the brownie batter (about 2 cups) into a prepared 9-inch square pan and bake for 10-12 minutes at 350 degrees.

Caramel Sauce

• Place caramel bits in a medium saucepan and turn heat to medium-low. Add in milk and stir until all caramel bits are melted (about 5 minutes). Remove from heat and add in vanilla, stir to full incorporate.
• When time is up, remove brownie from oven and cover with 1 cup of peanut butter morsels.
• Pour caramel sauce over over peanut butter morsels.
• Cover caramel sauce with remaining two cups of brownie batter.
• Bake for 18-20 minutes, or until edges start to get a little dark.
• Remove from oven and allow to cool completely, at least 4 hours.