Step 1

Heat broiler and line rimmed baking sheet with nonstick foil. Tear baguette into pieces and soak in 1/4 cup water until absorbed, then squeeze out all moisture and transfer to large bowl. Add eggs, chopped garlic, chopped spinach, Parmesan, oregano, and 1/2 tsp each salt and pepper and mix to combine. Add beef and mix until combined. Form into tiny balls (about 1 level tsp each, about 92 balls) and place on prepared baking sheet. Broil until browned, 6 to 8 minutes.

Step 2

Halve tomatoes and arrange, cut sides up, on second baking sheet. Drizzle with oil and sprinkle tops with pressed garlic and pinch each salt and pepper. Broil until garlic is fragrant, 3 to 4 minutes. Serve meatballs with tomatoes and sliced spinach.