1. Melt butter in a medium saucepan over medium heat. Add garlic, and sauté 1 minute or until tender and lightly browned. Add milk and next 3 ingredients, stirring with a whisk. Bring to a simmer, and add potatoes. Cook 2 minutes or until potatoes are smooth and fluffy, stirring occasionally. Stir in spinach; let stand 1 minute or until spinach begins to wilt. Serve immediately.