Homemade Burger Buns

Ingredients

• 1/2 teaspoon onion powder
• 1 large egg (lightly beaten)
• 1 teaspoon water
• 1 teaspoon chia seeds
• 1 teaspoon poppy seeds
• ½ large sweet potato
• 2½ cups (313 grams) all-purpose four (plus more as needed)
• 2 cups (250 grams) bread flour
• 2 tsp (6 grams) sea salt
• 8 tbsp (112 grams) unsalted butter (room temperature, divided)
• 1 cup (52 grams) yellow onion (diced)
• 2½ teaspoon (8 grams) active dry yeast
• ¾ cup (180 ml) water (warmed to 105 to 110F (40 to 45C))
• 2 tablespoons (30 ml) sourwood honey
• 2 large eggs (room temperature, lightly beaten)
• 2 teaspoons flaky sea salt
• 1 tablespoon sesame seeds