You can sub a sweet canned corn for the missing quantity of fresh corn and it still turns out delicious.
Cut corn kernels from cooked cobs.
Melt butter in a stockpot over medium-low heat. Add leeks and garlic. Cook, stirring occasionally, for about 5 minutes. Stir in corn and potatoes. Cook, stirring frequently, 10 minutes. Add milk, broth, salt and pepper. Simmer, uncovered, for 5 minutes.
Add chowder to serving bowls and sprinkle with cilantro.