Set your oven to 180°C (or 160°C if you're using a fan oven).
Line two 10 cm loose-bottom cake tins with parchment paper and set them aside.
If you haven't done so already, blend the oats until they have a flour-like consistency.
In a bowl, mix all the dry ingredients together.
Add the yogurt, vanilla extract, and milk to the bowl and mix well. It might look a bit clumpy, but that's okay.
Add the eggs one at a time, whisking well to add air to the mixture.
Pour the batter evenly into the two prepared cake tins. Use a spatula to scrape all the batter into the tins and gently tap them to even out the batter.
Bake for 20-25 minutes, until the cakes rise slightly and turn a light golden color.
Remove the cakes from the oven and let them cool in the tins for about 30 minutes. Then transfer them to a wire rack to cool completely (about another 15 minutes).
Spread the strawberry jam evenly over the top of the first cake layer.
In a bowl, mix together the cream cheese, milk, yogurt, and protein powder until smooth. You can use a whisk to get rid of any lumps.
Spread about 1/3 of the cream cheese mixture evenly over the jam layer.
Thinly slice the strawberries and place them on top of the cream cheese layer.