Combine first 9 ingredients in a bowl. Shape turkey mixture into 12 meatballs.
Heat a large nonstick skillet over medium-high heat. Add 1 1/2 teaspoons oil; swirl to coat. Add meatballs to pan; cook 4 minutes, turning to brown on all sides. Add sauce and 1/2 cup water; cook 7 minutes. Place meatball mixture in a bowl.
Wipe out pan with paper towels; return to medium-high heat. Add remaining oil and garlic; cook 30 seconds. Add spinach; cook 2 minutes, stirring until wilted. Place bread pieces, cut side up, on a baking sheet; top evenly with spinach, meatball mixture, and cheese. Broil 1 minute or until cheese is melted.
Pretty good. Odd to have spinach here. Not bad, but different. I used jar sauce and omitted the water. Hubby wolfed it down. I think a little fresh basil would add a lot. I also will toast the bread before topping next time.
I followed the previous review and used low-salt commercial, pasta sauce and omitted the 1/2 cup of water. These are really good and super flavorful. I accidentally forgot the egg and they still came out great. They are a bit messy so don't eat these wearing beautiful white shirts! I will definitely make this again.
This is was a huge hit with adults and kids alike. Meatballs were delicious! Lemon zest added wonderful flavor. Only suggestion would be if using jarred sauce you could probably omit the 1/2 cup in step 3. Sauce was a bit thin for our taste.
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