The recipe comes from Twelve Recipes by Cal Peternell, who notes that these "hot little balls make a nice snack or appetizer, but are also good later, to eat at room temperature out of hand on the go."

Fried Greens Meatlessballs

Serves 3 to 4 as an appetizer

• 1bunch greens, about 10 cups loosely packed, about 8 oz, see notes above
• 3tablespoons olive oil or grapeseed oil
• 1small yellow onion, diced
• Salt, to taste
• 2cloves garlic, chopped
• 1/2cup cilantro
• 1tablespoon cumin seeds
• 1cup fresh breadcrumbs
• 1/4cup crumbled feta
• 1 or 2eggs
• Oil for frying

1. Pulse greens in a food processor or finely chop with a knife—they should be small but not puréed or mushy. Set aside.
2. Heat a large skillet over medium-low heat and add the oil, onion, and salt. Cook, stirring occasionally, until soft and lightly browned, about 10 minutes. Add the garlic, cilantro, and cumin seeds. Stir for 30 seconds.
3. Add greens to pan and sauté for a minute or two, until they have wilted. Turn the mixture into a large bowl.
4. Let cool for five minutes, then add the breadcrumbs and feta. Mix well, then taste for seasoning. Add more salt if necessary—this is your chance to get the seasoning right while the mixture is egg-free. Crack one egg into the bowl and mix with your hands to incorporate. Squeeze a small ball of the mixture. If it holds together, begin portioning out the remaining mixture into small balls. If it doesn't hold together, add another egg. I usually find one egg to be enough.
5. Heat oil in a skillet over medium-high heat. Add balls to pan—they should sizzle when they hit the oil—then turn heat down to medium or medium-low. Cook until golden, about 2 minutes. Use a fork to flip the balls to the other side and cook for another 2 minutes or so. Serve immediately or at room temperature.

https://food52.com/recipes/37163-fried-greens-meatlessballs