My Family's Quick Hearty Fish Chowder

Ingredients

• 1 tablespoon olive oil
• 1 medium onion, chopped
• 2 cloves garlic, minced
• 2 medium potatoes, diced (about 2 cups)
• 1 carrot, diced
• 2 cups fish or vegetable stock
• 1 cup whole milk or heavy cream
• 1 pound firm white fish fillets (e.g., cod, haddock), cut into bite-sized pieces
• 1 cup frozen corn (optional)
• 1 teaspoon dried thyme
• Salt and pepper to taste
• Fresh parsley for garnish (optional)