Spinach Potato Knishes, Gluten-Free

Ingredients

• nach, chopped finely
• 1 large baking potato
• 1 tbsp. vegetable oil
• 1 tbsp. butter
• 1/2 large onion
• 1/2 tsp. ground black pepper
• 1-1/2 tsp. kosher salt
• 1 large egg
• Cooking spray
• contents of the bread mix packet
• 2 tbsp. oil or softened margarine
• 2 eggs
• 5 tbsp. milk, milk substitute, or water
• peeled potato, cut lengthwise and then into 2