Gradually add the oil while mixing constantly until the mixture is smooth.
Add the eggs, vinegar, and sour cream, and mix until well combined.
Add the buttermilk, ½ of the flour, and baking powder, and mix until almost combined. Add the other ½ of the flour and mix until just combined, and there are no visible lumps of flour.
Pour the batter into the prepared baking pan and bake the cake in a 180°C (350°F) preheated oven for about 35-40 minutes or until a toothpick inserted into the cake comes out clean with a few moist crumbs.
Allow the cake to cool completely. Run a butter knife or a thin spatula around the edges of the cake to release it from the sides of the pan.
Make the whipped cream
In a cold mixing bowl, beat cold heavy cream with powdered sugar, vanilla extract, and vanilla instant pudding. Whip until soft to medium peaks form.
Next, prepare the strawberries. Rinse them well, pat them dry, remove the stems, and slice or quarter them, depending on the look you want for your cake.
Once the vanilla cake is completely cool, place it on a serving plate. Spread the whipped cream evenly over the top, then layer on the sliced strawberries.
Notes
Use room temperature ingredients. It is important that you use room-temperature ingredients like eggs and butter. This step ensures that your mixture mixes into a homogenous mixture and bakes perfectly.
Measure your flour correctly! When measuring your flour, avoid scooping it with a measuring cup. Instead, stir the flour with a spoon to create as many air pockets as possible, and spoon it into your measuring cup. Finally, level it with a back of a knife.
Don’t overmix the cake batter, you don’t want to develop the gluten in the flour. This step ensures you have a moist cake and not a dense and dry cake.
Pat the strawberries dry. After rinsing your strawberries, gently dry them with a paper towel. Too much moisture can cause your whipped cream to slide off or make the top soggy.
Chill the bowl for whipped cream. Whipping cream works best when everything is cold. Pop your mixing bowl and beaters in the fridge or freezer for 10–15 minutes before whipping.
Don’t overwhip. Stop whipping as soon as you get soft peaks (when the cream just holds its shape). Overwhipping can turn it stiff or grainy, and eventually into butter!
Line your baking pan with parchment paper! This step helps the cake to bake evenly, and it makes sure that your loaf cake will release easily from the pan.
Test for doneness carefully. Insert a toothpick into the center, it should come out clean or with just a few crumbs attached when done.
Let the cake cool completely. If your cake is still warm, the whipped cream will melt and slide off. Give it time to cool fully before decorating.
Top just before serving. Strawberries can release juice and whipped cream can deflate over time, so for the freshest look and best texture, decorate close to serving time.