Preheat oven to 350 degrees F (175 degrees C) and line 14-18 muffin tins with paper cups.
In a medium bowl, whisk together All-Purpose Flour (2 cup), Unsweetened Cocoa Powder (1/2 cup), Baking Soda (1 teaspoon), Baking Powder (1/2 teaspoon), and Salt (1/2 teaspoon).
In a large bowl, whisk together Granulated Sugar (1 cup) and Canola Oil (1/2 cup). Add Large Egg (2) one at a time, whisking well after each.
Add Banana (3) to bowl along with Plain Greek Yogurt (1/3 cup), Orange Juice (1/4 cup), and Pure Vanilla Extract (1 teaspoon). Whisk to combine well, then add flour mixture, whisking until just combined and starting to smooth out.
Stir in Semi-Sweet Chocolate Chips (1 cup).
For large muffins, scoop a generous 1/3 cup of batter per muffin tin. For smaller muffins, use a 1/4 cup of batter per muffin tin.
Bake in preheated oven for 18-20 minutes, depending on size.
Remove from oven and allow to cool in pan slightly before moving to a cooling rack to cool completely.