Copycat Olive Garden Meatballs

Ingredients

• Cooking spray  -
• 2 large eggs -
• 2/3 c. (100 g.) plain dried bread crumbs -
• 1/2 c. whole milk -
• 2 tsp. Italian seasoning  -
• 1 1/2 tsp. kosher salt -
• 1 tsp. freshly ground black pepper  -
• 1 tsp. garlic powder -
• 1 tsp. onion powder -
• 1 lb. ground beef, preferably 80% lean -
• 2 tbsp. extra-virgin olive oil -
• 1 large yellow onion, finely chopped -
• 2 tbsp. plus 2 tsp. kosher salt, divided -
• 3 tbsp. tomato paste -
• 4 cloves garlic, finely chopped -
• 2 (28-oz.) cans diced tomatoes -
• 1 1/2 tsp. dried basil -
• 1/2 tsp. dried oregano -
• 2 tsp. granulated sugar -
• 1 lb. spaghetti -
• 1/4 c. chopped fresh parsley -
• Finely grated Parmesan, for serving -