Step 1

Preheat the oven to 400 degrees F. Line a baking sheet with foil and lightly grease or spray with cooking spray.

Step 2

Heat the butter in a small skillet over medium heat. When it melts, add the onion and cook until translucent, 3 to 5 minutes. Add the garlic and cook, stirring constantly, for 90 seconds. Remove from heat and cool for 5 minutes.

Step 3

In a large bowl, mix together the sausage and ground beef. Pulse the bread in a food processor or blender to make crumbs and sprinkle over the meat mixture. Add the onion mixture, egg, salt, and pepper and combine until well blended.

Step 4

Use a tablespoon to form the mixture into balls. Arrange on the prepared baking sheet and bake until the meatballs are lightly browned and cooked all the way through, about 20 minutes. Cool the baking sheet on a wire rack. Makes about 18 to 20 meatballs.