Preheat the oven to 350°F. Spray 2 8-inch round baking pans with nonstick spray and line the bottoms with parchment paper.
In a large bowl, whisk together sugar, flour, salt, baking powder, and baking soda.
In a medium bowl, whisk the egg, vanilla, and oil, then mix in buttermilk.
Combine buttermilk mixture with flour mixture and fold in ½ cup of sprinkles.
Divide batter between pans and bake for 18-20 minutes until tops are set.
Allow cakes to cool for 10 minutes in the pans before transferring to a rack to cool completely.
Soften strawberry ice cream at room temperature for about 10 minutes.
Prepare an 8-inch round pan with nonstick spray and plastic wrap. Layer 1 ½ pints of ice cream, sprinkle with 2 Tbsp of sprinkles, then add the remaining ice cream and sprinkles, pressing down.
Freeze the ice cream layer for at least 2 hours or until ready to assemble.
Beat heavy cream and confectioner’s sugar until stiff peaks form and refrigerate.
Assemble by placing one cake layer on a plate, topping with ice cream layer, then the second cake layer.
Spread whipped cream over the top and edge, sprinkle colorful jimmies, and return to the freezer for 30 minutes before serving.
Notes
This cake can be stored for up to 2 days in the freezer, covered loosely with plastic wrap.