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Once it's looking good, it's time to add creaminess and richness to the chowder. A mixture of one and a half cups of whole milk (or 2% milk) with two tablespoons of cornstarch is whisked together. This concoction thickens your chowder when added to the slow cooker, along with a quarter cup of sour cream and a mix of sharp cheddar and Monterey Jack cheeses. Leave it on high for an additional 30 minutes. The final result is a flavorful, thick chowder made even more indulgent with optional toppings like extra cheese and green onions.