Part 1: Prepare the Toppings and Guacamole

1. Sauté the Veggie Base: Heat 1 tablespoon of olive oil in a large skillet or pan over medium-high heat. Add the ½ diced red onion and the diced bell pepper. Sauté for 3-4 minutes until they begin to soften.
2. Spice it Up: Add the rinsed and drained black beans, the corn, and the 2 tablespoons of taco seasoning to the skillet. Stir everything together until well combined. Cook for another 3-5 minutes, stirring occasionally, until the beans and corn are heated through and the flavors have melded. Remove from heat and set aside.
3. Make the Guacamole: While the veggie mixture cools slightly, prepare your guacamole. Cut the avocados in half, remove the pits, and scoop the flesh into a medium-sized bowl.
4. Mash and Mix: Immediately add the fresh lime juice to the avocados. This adds the necessary tang and slows the oxidation process (browning). Using a fork or a potato masher, mash the avocados to your desired consistency—some prefer it chunky, others smooth.
5. Fold in the Flavor: Add the ¼ cup of diced red onion, ¼ cup of chopped cilantro, the minced jalapeño, minced garlic, salt, and optional cumin to the mashed avocado. Gently fold everything together until just combined. Over-mixing can make the guacamole pasty.
6. Taste and Adjust: Taste your guacamole and adjust the seasonings if needed. It might need another pinch of salt or a squeeze of lime. Press a piece of plastic wrap directly onto the surface of the guacamole to prevent browning and set it aside.

Part 2: Assemble and Bake the Nachos

1. Preheat and Prepare: Preheat your oven to 400°F (200°C). Grab a large, rimmed baking sheet. Using a large pan is crucial for spreading the chips out in a thin layer, which promotes even cooking and crispy results.
2. The First Layer (The Foundation): Spread half of the tortilla chips evenly across the baking sheet. Try to minimize overlapping as much as possible. Sprinkle half of the shredded cheese blend over the chips. This cheese layer acts as a barrier, helping to prevent the chips from getting soggy.
3. Add the Hearty Toppings: Spoon half of the cooked black bean and corn mixture evenly over the cheese-covered chips.
4. The Second Layer (The Masterstroke): Now, create the second layer. Carefully place the remaining half of the tortilla chips over the first layer. Sprinkle with the remaining shredded cheese, ensuring good coverage. Finally, spoon the rest of the black bean and corn mixture over the top. This double-decker method is the secret to getting toppings and melted cheese on almost every single chip.
5. Bake to Bubbly Perfection: Place the baking sheet in the preheated oven. Bake for 10-15 minutes, or until the cheese is completely melted, bubbly, and just beginning to turn golden brown at the edges. Keep a close eye on it, as oven times can vary, and you don’t want the chips to burn.
6. Final Assembly: Carefully remove the hot baking sheet from the oven. Let it cool for just a minute. Now it’s time to add the fresh, cool toppings. Dollop the homemade guacamole over the nachos. Add spoonfuls of sour cream and salsa. Garnish generously with any of your other chosen toppings, like pickled jalapeños, fresh cilantro, or diced tomatoes.