Okay, let's get baking! You've got this. Just follow these simple steps, and you'll be enjoying a slice of sunshine in no time.
1. First things first, preheat your oven to 350°F (175°C). This gives it time to get nice and hot. While it's heating up, grease and flour two 8-inch round cake pans. Make sure you get into all those nooks and crannies so your beautiful cakes don't stick.
2. Grab a large mixing bowl. Pour in your box of vanilla cake mix and that little box of orange gelatin mix. Give them a quick whisk together just to combine.
3. Now, add the wet ingredients: the orange juice, vegetable oil, large eggs, vanilla extract, and that lovely orange zest. Beat everything together with an electric mixer (or by hand if you want a workout!) until the batter is smooth. Be careful not to overmix – just until everything is combined and looks lovely and uniform.
4. Divide the batter evenly between your two prepared pans. You can eyeball it, or use a kitchen scale for perfectly even layers if you're feeling fancy! Pop them into the preheated oven.
5. Bake for about 25–30 minutes. You'll know they're done when a toothpick inserted into the center comes out clean. Keep an eye on them in the last few minutes, as oven times can vary.
6. Once they're out of the oven, let the cakes cool in their pans for about 10 minutes. This helps them firm up before you move them. Then, carefully invert them onto wire racks to cool completely. Patience is key here! Make sure they are totally cool before you even think about frosting them, or you'll have a melty mess.
7. While the cakes cool, let's make that dreamy frosting! In a medium bowl, beat your softened butter until it's light and fluffy. This incorporates air and makes the frosting super smooth.
8. Gradually add the powdered sugar, one cup at a time, beating on low speed until it's combined with the butter. Once it's mostly incorporated, you can turn the speed up a little to make it fluffy.
9. Now, add the heavy cream and the orange extract (if you're using it). Beat everything together until the frosting is smooth, creamy, and wonderfully spreadable. If it seems a little stiff, add another tiny splash of cream. If it's too thin, beat in a little more powdered sugar, a spoonful at a time.
10. Time to assemble! Place one completely cooled cake layer on your serving plate or cake stand. Spread a generous layer of that delicious orange-vanilla frosting on top, right to the edges.
11. Carefully place the second cake layer on top of the frosted layer. Now, use an offset spatula or knife to frost the top and sides of the entire cake. Make it as smooth or as rustic as you like! You can add extra orange zest on top or some cute sprinkles if you want to make it extra festive.