Cheesy Ham and Potato Soup

Ingredients (12)

• 1 tablespoon olive oil
• 1 small yellow onion
• 2 cloves garlic
• 5 cups  washed
• 2 14 ounce cans chicken or vegetable broth
• 3 tablespoons unsalted butter
• 3 tablespoons all-purpose flour
• 2  cups milk
• 1 cup shredded sharp Cheddar cheese
• 2 cups diced leftover ham
• Salt and black pepper
• Sliced green onions