Creating Texas Tornado Cake can be straightforward if you follow these simple steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans.
2. Mix Dry Ingredients: In a large bowl, sift together flour, granulated sugar, cocoa powder, baking soda, and salt.
3. Mix Wet Ingredients: In another bowl, whisk together the eggs, buttermilk, vegetable oil, and vanilla extract until well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients and stir until smooth.
5. Add Nuts and Coconut: Fold in the chopped pecans or walnuts and shredded coconut until evenly distributed.
6. Incorporate Boiling Water: Carefully add the boiling water to the batter, mixing well to create a smooth consistency.
7. Divide Batter: Pour the batter equally into the prepared cake pans.
8. Bake: Place in the oven and bake for 45-50 minutes, or until a toothpick inserted in the center comes out clean.
9. Cool Cakes: Remove from the oven and let the cakes cool in their pans for 15 minutes, then transfer them to a wire rack to cool completely.
10. Prepare Frosting: While the cakes cool, beat together the softened butter and cream cheese until fluffy. Gradually add in the powdered sugar, milk, and vanilla extract until smooth.
11. Assemble the Cake: Once cool, place one cake layer on a serving platter. Spread a layer of frosting on top, then add the second layer. Frost the top and sides of the entire cake.
12. Garnish: For a finishing touch, sprinkle additional chopped nuts on top of the frosted cake if desired.

These steps will guide you in creating this incredible cake effortlessly.