Prepare the Bean Layer: In a large mixing bowl, combine the black beans with salt, garlic powder, cumin, and cayenne pepper. Stir until all the seasonings are well incorporated.

First Layer: Spread the seasoned bean mixture evenly across the bottom of a 9x13-inch baking dish or a 3-quart casserole dish.

Second Layer: Top the beans with the cooked ground beef, spreading it out to cover the beans completely.

Cheese Layer: Sprinkle 2 cups of shredded cheddar cheese over the beef for the third layer.

Baking: Place the dish in the oven and bake at 350°F (175°C) for about 20 minutes, or until the cheese is melted and the layers are hot and bubbly.

Cool and Add Guacamole: Once the dish is out of the oven, allow it to cool slightly, just enough to warm but not too hot. Then, spread the guacamole evenly over the top of the beef and cheese layer.

Sour Cream Layer: Carefully spread the sour cream over the guacamole, making sure to cover it fully. This helps keep the guacamole from turning brown.

Salsa Layer: Spoon and spread the salsa evenly over the sour cream layer.

Top with Cheese: Add another sprinkle of shredded cheddar cheese on top of the salsa.

Final Garnishes: Finish by scattering sliced green onions, jalapeños, and fresh cilantro over the top for a flavorful and colorful finishing touch.