01 - Preheat oven to 350°F. Line a 9x13-inch baking sheet with parchment paper and lightly grease with butter or cooking spray.
02 - In a medium bowl, whisk together flour, granulated sugar, salt, and baking powder until evenly blended.
03 - In a separate bowl, beat eggs with milk, melted butter, and vanilla extract until smooth and well combined.
04 - Pour the wet ingredients into the dry ingredients. Fold gently until just combined, being careful not to overmix.
05 - Spread the batter evenly onto the prepared baking sheet. Bake for 12 to 15 minutes until the cake springs back when lightly touched in the center. Cool completely on a wire rack.
06 - While cake cools, whip heavy cream with powdered sugar and vanilla extract using an electric mixer until stiff peaks form. Do not overwhip.
07 - Gently remove the cooled cake from the pan and place on a clean, flat surface. Trim the edges with a sharp knife for even rolling.
08 - Spread whipped cream evenly over the cake surface, leaving a 1/2-inch border along one long side. Sprinkle diced strawberries uniformly across the cream layer.
09 - Starting from the long side opposite the border, carefully roll the cake into a tight cylinder. Use the parchment paper to guide and support the roll as you work.
10 - Wrap the rolled cake in parchment and refrigerate for 20 minutes to set. Remove and slice into 8 even pieces, approximately 1 1/2 inches thick each.
11 - Top each sushi roll with a thin strawberry slice and sprinkle with chopped mint if desired. Serve chilled for best texture and flavor.