Preheat oven to 350°F. Line a 10x15” or 10.5x15” cake/jelly roll pan with foil and spray with floured nonstick cooking spray.
Place eggs in a large bowl or the bowl of an electric mixer. Beat at medium speed with mixer for 5 minutes until foamy and yellow. Add sugar and mix for 2 more minutes, until the mixture is thickened slightly. Mix in oil, baking powder, salt, and vanilla, then add flour and mix slowly until just combined. Pour into prepared pan, spreading as needed with a spatula. Bake for 10-15 minutes, or until the top is browned and the cake springs back when touched lightly. (Mine took 12 minutes, but all ovens differ.)
While the cake is baking, lay out a clean kitchen towel onto the counter. Spread with about 1/4 cup powdered sugar.
Remove the hot cake from the oven and carefully, using oven mitts so you don’t burn yourself, flip the cake onto the towel. This might make a mess, but that’s okay. Carefully remove the pan and foil (they’re hot!) and then, using the towel, roll up the cake from the short side. The towel will be rolled into the cake. Let this cool completely before continuing.
Note: you can wrap the cooled cake in plastic wrap and let it sit overnight before finishing.
Make the filling: place cream cheese and sugar in a large bowl or the bowl of an electric mixer. Use mixer to beat the cream cheese and sugar until it’s smooth and fluffy, then beat in vanilla. Slowly add the heavy whipping cream, then turn the mixer up to high and beat until stiff peaks form. Halfway through mixing, stop the mixer and scrape down the sides and bottom of the bowl. Stir sprinkles into the whipped cream.
To fill cake: Carefully unroll the cake. Spread with the whipped cream mixture. Carefully roll the cake back up as tight as possible, unsticking it from the towel as you go. Wrap the cake roll in plastic wrap and chill until ready to top and serve.
To top: place chocolate chips and heavy whipping cream in a microwave safe measuring cup or bowl. Heat on high power for 60-90 seconds or until the cream is hot, then whisk until smooth. Let cool for 10 minutes. Place cake roll on a wire rack set over a cookie sheet. Pour the ganache over the cake evenly. Top with rmore sprinkels. Chill until set.