For the Meatballs:
Preheat the oven to 450°F. Drizzle the olive oil into a 9×13-inch baking dish and use your hand to evenly coat the entire surface. Set aside.
Combine the ground beef, ricotta, eggs, bread crumbs, parsley, oregano, salt, red pepper flakes, and fennel in a large mixing bowl and mix by hand until thoroughly incorporated.
Roll the mixture into round, golf ball-size meatballs (about 1 1/2 inches), making sure to pack the meat firmly. Place the balls in the prepared baking dish, being careful to line them up snugly and in even rows vertically and horizontally to form a grid. The meatballs should be touching one another.