STEP 2:
For the graham cracker batter, whisk flour, graham cracker crumbs, baking powder, salt & sugar. Add oil & whisk. Add egg & mix, then add milk & sour cream. Mix until smooth.
STEP 3:
Alternate scooping spoonfuls of chocolate batter & graham cracker batter into each muffin tin, then swirl the batters together. Bake at 350F for 16 minutes.
STEP 4:
Create a double boiler and whisk the egg whites & sugar over low heat until the sugar is dissolved. Remove from heat & beat mixture with a stand mixer until stiff peaks form.