Combine meatball ingredients. Form into 1½ inch balls. Place on a baking rack on a parchment paper covered baking sheet. Bake in oven for 30 minutes.
Remove from oven and let rest for 5 minutes before cutting each meatball in half.
Smear half of tortilla with sour cream. Add 3-4 meatball halves and drizzle with salsa verde. Add radish slices and cilantro leaves. Sprinkle with cojita cheese. Repeat with remaining tortillas.