Preheat oven to 350°F. Lightly grease five 3.5-inch mini cast iron skillets and then place onto a large baking pan (for easy removal from oven). Set aside.
In a medium bowl, add pancake mix, cold water, baking powder, and vanilla. Stir until just combined and let sit for 2 minutes.
Pour 1/2 cup of batter into each skillet and drop 1 tablespoon of jelly into the batter of each skillet and gently swirl with a knife.
Bake 15-18 minutes, or until centers are firm. Remove from oven and let cool for 5 minutes.
Peanut butter syrup:
In a small bowl, microwave peanut butter on medium power for 15-20 seconds, or until slightly melted. Add maple syrup to peanut butter and stir to combine.
Drizzle over pancakes and serve with fresh strawberries and powdered sugar, if desired.