Sauté onion, garlic, pinch chili flakes. Add in shrooms and sauté until they soften.
Add mushroom mix to food processor with remaining ingredients. Pulse until mixture just comes together, you are not looking for a paste. Transfer to a bowl and place in fridge to firm up (about 30 minutes).
Preheat oven to 400ºF/200ºC. Line a sheet with parchment. Roll balls about 1 ½-2 inches (mine were pretty big) and place on sheet.
Bake for 20 minutes, turn and bake again for 10. Balls should be firm and crisp on the outside and still tender and juicy on the inside.