hearty corn chowder with smoked sausage

Ingredients

• 1 tablespoon garlic, minced
• 1/2 cup onion, chopped
• 1/4 cup green pepper,chopped
• 1 package smoked sausage, sliced
• 1 tablespoon olive oil
• 1 can corn, drained
• 1 can cream style corn
• 2 teaspoons salt, or season to taste
• 2 teaspoons pepper, or season to taste
• 1 stick butter
• 1 cup half and half
• 3 - russet potatoes, cut into chunks, skin on if you like
• 1 1/2 cups instant mashed potatoes, (thickener)
• 4 cups water