Combine flour and salt in a large mixing bowl, then add the shortening and mix until it resembles coarse breadcrumbs.

Gradually pour in warm water while mixing until a soft, slightly sticky dough forms.

Transfer the dough to a clean surface and knead for about 2 minutes until smooth.

Cover the dough with a damp cloth and let it rest for 10 minutes.

Heat butter in a small saucepan over medium heat, then add the refried beans and garlic powder, stirring for about 3 minutes until warmed.

Divide the dough into 8 equal portions and roll each into a ball.

Flatten each ball using a tortilla press or a heavy pot to create a thin disk.

Heat a skillet over medium-high heat and cook each tortilla for about 30-45 seconds on each side.

Transfer cooked tortillas to a clean kitchen towel to keep warm.

Spread warm beans down the center of each tortilla, top with cheese, avocado, and eggs if desired.

Fold the tortilla in half and serve with hot sauce or salsa.