Ingredients
Method
- Preheat oven to 350°F (180°C) and grease a 9x13-inch baking pan. Prepare the cake mix as directed, fold in 1 cup blueberries, and bake 25-30 minutes until a toothpick comes out clean. Cool 10 minutes.
- Dissolve lemon Jell-O in boiling water, then stir in cold water. Poke holes all over the warm cake with a wooden spoon handle and slowly pour the Jell-O mixture over the top. Cover and refrigerate at least 2 hours.
- Whisk pudding mix and cold milk until thick, about 2 minutes. Fold in the thawed whipped topping gently.
- Spread the lemon topping over the chilled cake, scatter extra blueberries on top, cover loosely, and refrigerate at least 1 more hour or overnight.
- Slice the cold cake into squares with a sharp knife, wiping the blade between cuts, and serve chilled.
Notes
Chilling times are not included in the prep or cook totals above; plan for at least 3 hours in the refrigerator total. This cake is even better the next day, so it is a great make-ahead dessert. Store any leftovers covered in the fridge for up to 4 days.
