Add ½ cup of the half-and-half to a small saucepan over medium-low heat.
½ Cup Half and Half Cream
Whisk in the cocoa powder and continue whisking until completely smooth and fully incorporated. Do not boil.
4 Tbsp Red Alkalyzed Cocoa Powder
Remove from the heat and allow the chocolate mixture to cool.
In a Ninja Creami Deluxe pint container, combine the pasteurized egg whites, remaining ½ cup half-and-half, and sugar.
¼ Cup Egg Whites, ½ Cup Half and Half Cream, ¼ Cup White Sugar
Using a small drink frother or mini immersion blender, blend until the sugar begins to dissolve.
Add the cooled cocoa mixture to the pint container and blend again until smooth.
½ Cup Half and Half Cream, 4 Tbsp Red Alkalyzed Cocoa Powder
Add the milk and vanilla extract. Blend briefly until evenly combined.
1 Cup Milk, 1 Tsp Vanilla Extract
Ensure the mixture remains below the max fill line.
Secure the lid and freeze on a level surface for 24 hours.
Remove the lid and place the frozen pint into the Ninja Creami outer bowl. Secure according to the manufacturer's directions.
Process using the Ice Cream setting.
If adding chocolate chips, create a small well in the center of the ice cream, add the chocolate chips, and run the Mix-In setting.
If not using mix-ins and the ice cream remains dry or powdery after the first spin, process using the Re-Spin function.
Serve immediately or return to the freezer for later.