Evenly grease a 9 x 9-inch baking dish with vegetable oil or any neutral oil using a paper towel to ensure an even, light coating.

Proceed to cook short-grain rice according to the package instructions, either using your rice cooker or cooking it on the stovetop.

Preheat your oven to 500 degrees F.

Once the rice is cooked and hot, transfer it to a large bowl.

Season the rice by mixing in salt, sugar, and rice vinegar thoroughly using a rice paddle.

Spread the seasoned rice evenly and firmly press it into your prepared baking dish.

Sprinkle sesame seeds and furikake evenly over the rice layer.

Open your canned tuna and strain out as much liquid as possible using a fine sieve and fork.

Transfer the strained tuna into a medium-sized bowl.

Mix it with Japanese mayo, sriracha sauce, and salt to taste.

Spread this spicy tuna mixture evenly over the seasoned rice layer in the baking dish.

Peel and thinly slice avocados.

Lay these slices over the layer of spicy tuna.

Generously drizzle Japanese mayo and sriracha sauce over the avocado to add flavor and richness.

Place the dish in the preheated oven and broil for about 10 minutes until the sauces on top are bubbling and turn a golden brown color.

Once done, remove it from the oven and garnish with finely sliced green onions for added freshness and flavor.

Use a wet knife to slice the sushi bake into 20 pieces.

To serve, scoop a portion of the filling onto a small sheet of nori.

Enjoy this deliciously layered sushi bake as a flavorful treat!