01 -
Preheat oven to 175°C and line two muffin tins with paper liners.
02 -
In a large bowl, beat vegetable oil, light brown sugar, eggs, and vanilla extract until combined.
03 -
Add smooth peanut butter to the wet mixture and beat until no lumps remain.
04 -
In a separate bowl, whisk together all-purpose flour, baking soda, and salt.
05 -
Gently whisk sour cream and milk together in a measuring cup.
06 -
By hand, gently fold half of the dry ingredients into the peanut butter mixture, followed by half of the sour cream and milk mixture. Repeat with remaining halves until just combined, avoiding overmixing.
07 -
Spoon batter into liners, filling each about two-thirds to three-quarters full, yielding approximately 16 cupcakes.
08 -
Bake for 20 to 24 minutes, or until a toothpick inserted in the center emerges clean.
09 -
In a large bowl, beat softened butter until fluffy.
10 -
Beat in peanut butter until smooth and well incorporated.
11 -
Add vanilla extract and 2 cups (around 240 g) powdered sugar; beat on low speed until combined.
12 -
Gradually add remaining powdered sugar in 120 g increments, alternating with 1 tablespoon of cream or milk, beating until desired sweetness and consistency are achieved.
13 -
Frost cupcakes using a knife or piping bag fitted with a 1M tip and garnish with peanut butter candies.