If you're looking for a safe place to eat a GF burger in Denver, hopdoddy is a very good option. Dedicated GF fryer and solid burger options, plus staff that were both knowledgeable about celiac disease and friendly in conveying that knowledge. I enjoyed my shroom burger (though that GF bun is admittedly on the dry side) and sweet potato fries.
— Very
— Gluten-free items are marked on the main menu
— Most/All
— Good