Preheat oven to 350℉ (180℃)
Prepare two 9" x 13" sheet pans by lining with parchment paper or silcone baking mats.
Whisk together flour, salt and baking powder in a medium bowl. Set aside for later.
1 ¼ Cup Gluten-free flour, ½ teaspoon Salt, ¾ teaspoon Baking powder
Place chocolate chips and butter in a heat-proof bowl. Microwave at 50% power for 30 seconds then stir. Continue to heat at 50% power in 30 second bursts, stirring between each heating, until all chocolate and butter is melted. Take care not to overheat the chocolate as it can scorch easily.
1 Cup Chocolate chips, 4 Tablespoons Butter
Place the sour cream, oil, egg, granulated sugar and vanilla extract in a large mixing bowl. Combine well using a whisk.
1 Large Egg, ¾ Cup Granulated Sugar, 2 Tablespoons Vegetable or Canola Oil, ½ Cup Sour cream, 1 teaspoon Pure Vanilla Extract
Add melted chocolate and butter to the mixing bowl. Combine well using a whisk.
Add the dry ingredients (flour, salt and baking powder) to the mixing bowl and stir until well combined.
Set the dough aside for 10 minutes – the mixture will set up slightly.
Scoop the dough onto the parchment-lined baking sheets using a small cookie scooper (approximately 1 ½ tablespoon per cookie). Leave approximately 2 inches of space between each cookie to allow for spreading.
Bake cookies for 7 - 8 minutes. Top of cookies will have a slightly crackled surface.
Let cookies cool on the baking sheets for 5 to 10 minutes, then transfer to a wire rack to cool completely.