I looked this up and as it says in the discussion, it is the old reliable 1234 cake.
I have made that one with just plain old flour for years.
If cakes are baking "flat", I'd get some new baking powder.
But also in seaching I found this one that uses buttermilk and I'd bet it has a great tangy taste and will try that soon.
1-2-3-4 Buttermilk Cake
2 Sticks butter
2 Cup(s) Sugar
4 Eggs; separated
3 Cup(s) Flour
2 Teaspoon(s) Baking powder
1 Cup Buttermilk
1/2 Teaspoon(s) Lemon extract
1/2 Teaspoon(s) Vanilla
Using an electric mixer, cream the butter, sugar, and egg yolks. Mix the flour and baking powder together and sift into the creamed mixture, adding alternately with the milk. Add the flavorings. Whip the egg whites to form stiff peaks and gently fold into the batter. Bake in a loaf pan in a preheated oven at 300 for 1-1/4 hours, or until a toothpick stuck into the center of the cake comes out clean