Preheat oven to 350F. Line an 8x8 square pan with tin foil and lightly grease.

I like to use my Pyrex Baking Pan because it is incredibly durable, and is dishwasher, microwave, and refrigerator safe.

In a large bowl, beat peanut butter, egg, sugar, baking soda, salt, and vanilla until smooth. Press mixture evenly into prepared pan. Bake bars at 350F 13-15 minutes or until a light golden-brown. Remove from oven and cool.

Make the caramel: In a small saucepan, bring butter, sugar, and agave to a low boil over medium-high heat. Stir occasionally until mixture is a deep golden brown and slightly thickened. Remove caramel from heat and whisk in baking soda and salt.

I found these uniquely designed whisks and to be honest I have not bought them yet but I am seriously considering it even though I have about 10 whisks in my kitchen. They are made of silicone so they won't scratch or damage your pots and they claim to not leave any corners untouched with their one of a kind design.

Drizzle warm caramel over bars and let stand 10 minutes until caramel is slightly set. Slice into squares and serve bars. Enjoy!