Grease an 8" cake pan with butter, place a round of parchment in the bottom and butter that too. Pre-heat oven to 350 degrees F.
In a medium mixing bowl, add egg whites and beat until fluffy, approximately one minute.
Gradually add sugar and baking powder and stir until batter resembles runny pancake batter.
Add vanilla and coconut oil, if using, beating until well incorporated.
Add 16 saltines to a sandwich bag and crush with your hands or the back of a wooden spoon until crackers are about pea-sized pieces.
Add chopped walnuts and saltines to batter and fold in with a large spoon or spatula.
Pour batter into the cake pan and spread to edges.
Place pan in oven and immediately lower temperature to 325F. Bake for 30-35 minutes or until top and edges are slightly golden.
Remove from oven and immediately run a knife around the edge of pan to help release torte from the edge. Let cool completely on wire cooling rack.
Have a cake plate ready. Again, run knife around edge of pan. Place cake plate over the cake pan and flip over gently. Remove the parchment from the torte.
In a stand mixer or in a large bowl, add whipping cream. Add sugar and vanilla to taste and whip to desired stiffness. Taste and add more vanilla and sugar if desired, whipping again to incorporate. Spread whipped cream to edges.
If time allows, chill at least one hour or even overnight before serving to let whipped cream soften the top of the torte a bit.