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In 10-inch nonstick skillet, heat 2 tablespoons of the oil over medium-high heat until shimmering. Add onion, garlic, cumin, coriander and pepper flakes; cook 4 to 6 minutes, stirring frequently, until browned. Transfer mixture to blender and cool several minutes; add 1 cup of the broth, half the drained corn and the oregano; cover and blend until smooth.