Arrange sausages evenly in slow cooker.

Whisk maple syrup, brown sugar, Dijon, soy sauce, garlic powder, and pepper thoroughly in medium bowl.

Pour over sausages; gently stir to coat evenly.

Cover; cook on low 3-4 hours or high 1.5-2 hours, stirring occasionally.

Uncover for final 30 minutes to thicken glaze, stirring every 10 minutes.

Serve from cooker on warm with toothpicks.