Step 1

Stir together sugar, cocoa, and flour together in a microwave-safe bowl.

Step 2

Add in egg yolks and milk then stir until combined.

Step 3

Cook in the microwave on full power for 2 minutes. Stir. Cook 3 more minutes. Stir. Continue cooking in 2-minute intervals until thick and pudding-like consistency.

Step 4

Stir in margarine and vanilla then pour into baked pie shell.

Step 5

Beat egg whites and cream of tartar in a glass bowl until foamy, add in sugar 1 Tbsp at a time. Beat until stiff peaks form.

Step 6

Spread on top of pie filling. Bake in 350 degree F oven for 12-15 minutes until browned.