There is no indication if you want a recipe for fondant [sugar paste covering] for cakes or an actual cake called "fondant cake.

I did a quick search and this recipe came up. [I have made this cake numerous times under the title of "Nanna's cake" or "Cream Cake".

Fondant Cake

3/4 cup cream
2 cups powdered sugar
2 cups flour
2 eggs

Blend and put in wax paper lined shallow pan. Sprinkle with lemon rind or nuts. Bake for 20 minutes at 375 degrees.