Corn Chowder with Ham

Name: Corn Chowder with Ham
Ingredients: 1.5 cups Frozen Corn Kernels; 1.5 cups Diced Ham; 1/2 Large Onion (finely diced); 1 stalk Celery (chopped); 2 Carrots (chopped); 4 Garlic Cloves (minced); 1 lb Potatoes (diced. I prefer to buy yukon gold because the skin is soft and you can keep it on.); 3 tbsp Butter; 3 tbsp Flour; 1.5 cup Milk; 3 cups Chicken Broth; 3/4 tsp Sea Salt (plus more to taste); 4 shakes Black Pepper; 1/4 tsp Ground Sage; 1/2 tsp thyme; 1 cup Shredded Cheddar Cheese; 1/4 cup yogurt (or sour cream)