To make the two ingredient dough: In a large mixing bowl, combine the flour and yogurt, stirring until they are well combined. If the mixture is too sticky, add a tablespoon of additional flour and continue to mix. Repeat as necessary until the mixture becomes a workable ball of dough. Remove the dough from the bowl and knead on a lightly floured surface, until the dough is smooth.
Preheat the oven to 425 degrees. Divide the dough 8 equal pieces. Roll each piece into a long piece about 8-10 inches long. Place each piece on a baking sheet, lined with parchment paper. Brush the top of each breadstick with melted butter or olive oil and sprinkle with garlic salt and cheddar or parmesan cheese, if desired.