Step 1: Prepare the dough

• In a mixing bowl, combine flour, sugar, salt, and instant yeast.
• Gradually add warm water and vegetable oil, mixing until a soft dough forms.
• Knead the dough on a lightly floured surface for 5-7 minutes until smooth and elastic.
• Place the dough in a greased bowl, cover, and let it rise for 1 hour or until doubled in size.

Step 2: Prepare the filling

• In a skillet, heat 1 tablespoon of vegetable oil over medium heat.
• Add chopped onion and garlic; sauté until fragrant.
• Add ground turkey, soy sauce, sesame oil, ground ginger, salt, and pepper.
• Cook until the turkey is fully browned. Stir in optional vegetables if using. Remove from heat and let cool.

Step 3: Shape the buns

• Punch down the risen dough and divide it into 10 equal portions.
• Roll each portion into a ball and flatten into a small circle.
• Place a spoonful of turkey filling in the center of each circle. Gather the edges and pinch to seal, forming a bun.

Step 4: Pan-fry the buns

• Heat 2 tablespoons of vegetable oil in a nonstick skillet over medium heat.
• Place the buns seam-side down in the skillet and cook for 2-3 minutes until the bottoms are golden brown.
• Add 1/4 cup water to the skillet and cover with a lid. Let the buns steam for 6-8 minutes until cooked through and the water evaporates.
• Remove the lid and cook for another 1-2 minutes to crisp the bottoms.

Step 5: Serve

• Transfer the buns to a serving plate and garnish with chopped green onions or sesame seeds if desired. Serve warm with your favorite dipping sauce.