Corn tamales with avocado-tomatillo salsa

Ingredients

• 18 dried corn husks, plus extra husks to make ties
• 3 cups fresh or frozen corn kernels (thawed), divided
• 2 cups masa harina
• 1/2 cup lukewarm water
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 3 tablespoons canola oil
• 1/4 cup diced red bell pepper
• 1/4 cup diced green bell pepper
• 2 tablespoons diced yellow onion
• 1/8 teaspoon red pepper flakes
• 1/4 cup chopped avocado
• 4 medium tomatillos, husked and chopped (about 2 cups)
• 1 tablespoon fresh lime juice
• 2 tablespoons chopped fresh cilantro (coriander)
• 1/2 teaspoon seeded, minced jalapeno pepper