In a small bowl, combine warm water with sugar, stirring until dissolved. Sprinkle the active dry yeast over the top and let it sit for 5-10 minutes until frothy and bubbly.

In a large mixing bowl, whisk together all-purpose flour and salt, adding garlic and onion powders if desired.

Once the yeast mixture is frothy, add melted unsalted butter, milk, and a large egg to the bowl with the dry ingredients. Stir until just combined to form a shaggy dough.

Turn the shaggy dough onto a floured surface and knead for about 8-10 minutes until it becomes smooth and elastic.

Place the kneaded dough in a greased bowl, covering it with a damp cloth or plastic wrap. Allow it to rise for about 1 hour, or until it has doubled in size.

Once risen, gently punch down the dough to release any air bubbles. Shape the dough into a rectangle about 1 inch thick and slice it into thick pieces.

Arrange the slices on a parchment-lined baking sheet, cover with a cloth and let them rise for an additional 30 minutes to 1 hour until puffy.

Preheat your oven to 375°F (190°C). Bake the Texas Toast slices for 15-20 minutes, or until golden brown.

After removing from the oven, brush the warm slices with melted butter.