In the bowl of a food processor, add the broccoli, spinach, and rice and pulse to combine. It is better combined in another bowl, and transferred to the food processor.
Add the egg, flour (and baking soda and baking powder as listed) garlic powder, cheddar cheese, parsley, and season with salt and pepper.
Pulse to combine. Spread the mixture onto a parchment-lined baking sheet.
Place in the refrigerator for 1-2 hours, until firm.
Prepare a second baking sheet with parchment paper.
Remove the baking sheet from the refrigerator. Using cookie cutters, punch out the vegetable mixture and place the shapes onto the prepared baking sheet.
Cover with plastic wrap and place the veggie shapes in the freezer overnight or until ready for use.
Preheat the oven to 450 degrees. Bake the veggie nuggets for 10 minutes, flipping halfway through, until golden brown.