Place the potato cubes in a steamer pot over boiling water and cook for 8 minutes.
Add the broccoli to the steamer pot and steam the vegetables for an additional 2 minutes, or until they are fork tender. Then, remove everything from the pot and allow them to cool.
Mash the potatoes in a large bowl and chop the broccoli florets into bite-size pieces.
Add the broccoli, cheese, panko, salt, egg, garlic and onion powder to the bowl and combine.
Place the remaining 1/2 cup of panko in a separate bowl
Using an ice cream scoop or 2 tablespoon measure, roll the mixture into balls, coat them in the panko and then shape each one into a small patty.
Heat 1 tablespoon of oil in a skillet over medium heat, place the patties in the skillet and press down with a spatula to flatten a little.
Pan-fry for 3-4 minutes on each side until golden.
To Freeze: After Step 6, place the patties on a baking sheet and freeze for one hour. Transfer the patties to zipper bags and label. Defrost when ready to use and cook following step #7.