Start by preparing the corn on the cob. You can grill the corn, air fry the corn, or pan fry corn kernels in a skillet. Choose a method, cut the kernels off the cob, then place into a mixing bowl.
Dice the onion and jalapeño, then add to a skillet with a little oil. Sauté over medium heat, until the onion is translucent. Transfer to the mixing bowl and stir together with the corn kernels. Season with salt and pepper, then set aside.
Slice the tomato and set aside, then toast each slice of bread.
Cut the avocado in half, remove the pit, and spread over each toasted slice of bread. Top each with a tomato slice and a spoonful of corn salsa.
Squeeze lime juice over each slice of avocado toast, optionally garnish with chopped cilantro. Serve and enjoy immediately!