Pat the corn dry and slice the green onions. Beat the eggs in a small bowl.
Whisk flour, cornmeal, baking powder, salt, pepper, garlic powder, paprika, and sugar in a large bowl.
Whisk milk into the beaten eggs until smooth.
Stir the egg-milk mixture into the dry ingredients just until combined; do not overmix.
Fold in corn, green onions, cheddar, and parsley. Let the batter rest 5 minutes.
Heat a thin layer of oil in a large skillet over medium heat until shimmering.
Scoop 1/4-cup mounds of batter into the pan and gently flatten.
Fry until deep golden, 3–4 minutes per side, turning once. Adjust heat as needed.
Drain fritters on a rack or paper towels. Sprinkle with a pinch of salt and serve warm.