Preheat oven to 400 degrees F (200 degrees C).
Line a baking sheet with aluminum foil.
Mix mild sausage and hot sausage in a large bowl until evenly blended.
Stir Cheddar cheese into sausage mixture.
Mix biscuit baking mix into sausage mixture about 1/2 cup at a time until baking mix is moist.
Roll meat mixture into 1 1/4- to 1 1/2-inch balls.
Arrange meatballs on prepared baking sheet.
Bake in the preheated oven until meatballs are no longer pink in the center and cheese is browned, about 20 minutes.
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