ham and leek muffins

Ingredients

• 2 tablespoons oil (salad, veggie or peanut is fine)
• 1 - leek, washed trimmed and finely chopped (white part only)
• 2 cups all purpose flour
• 2 teaspoons baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon garlic salt
• 1/4 teaspoon salt
• 1 pinch pepper
• 1 1/4 cups thick strained plain yogurt
• 1 - large egg, lightly beaten
• 4 tablespoons butter, melted
• 1 cup cheddar cheese, grated
• 1 tablespoon fresh chopped chives
• 6 ounces chopped cooked ham