Place the zucchini in a medium saucepan with 1 cup water; season lightly with salt and pepper. Bring to a boil and simmer, covered, over medium heat for 2 minutes. Set aside without draining.
Heat the oil in a large nonstick skillet over high heat until hot but not smoking. Reduce the heat slightly and add the garlic and onion. Cook, stirring until the onion is translucent, about 2 minutes. Stir in the tomato and cook until its liquid is partly evaporated, about 5 minutes. Stir in the corn and poblanos and simmer 5 minutes more.
Add the zucchini and its cooking liquid along with the evaporated milk to the corn-chile mixture and bring to a boil. Reduce the heat to low, stir in the Cheddar, and cook just until it melts. Serve immediately.
All recipes courtesy of "The Strang Cookbook for Cancer Prevention"