Preheat oven to 450°F.
Prepare the plain mashed potatoes by following the directions on the box or package. (See Tip 1.)
Add the mashed potatoes to a large mixing bowl. Add the melted butter and the egg and mix well with the mashed potatoes until smooth.
Add the rice flour, potato starch, salt and baking powder. Mix gently just until this forms to a smooth dough.
Cover the dough well with plastic wrap to protect it from drying out and place it in the refrigerator for 20-30 minutes.
While the dough is chilling, mix together the herb topping. Combine the garlic powder, dried onion, dried parsley, dried basil, pepper and salt in a small bowl and set aside.
Remove the chilled dough from the refrigerator and place it on a cutting board that has been lightly dusted with rice flour. Cut the dough into 16 pieces. Roll each piece into a ball with your hand then gently flatten into a small circle with your fingers. Place on a baking sheet lined with parchment paper. Brush each circle of flatbread with a bit of the melted butter and sprinkle with the herb mixture.
This dough needs to be kept chilled to be easily managed. If the dough begins to stick to your hands and the cutting board, place it back in the refrigerator.
Bake for about 10-15 minutes, just until lightly golden brown.