1. Place shortening and peanut butter in a mixing bowl and beat.
2. Add granulated sugar and brown sugar and beat.
3. Add salt, egg, and vanilla.
4. Add flour, baking powder and mix until just combined.
For frosting:
Combine 3 Tbs butter, 2/3 cup peanut butter, powdered sugar, pinch salt, milk, and lemon juice.
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