Preheat oven to 325 F. Prepare a baking sheet with a silicone baking mat or parchment paper.Place red bell pepper in a blender and pulse several times until it's diced finely. It should be somewhat liquidly.In a large mixing bowl, combine turkey breast, garlic powder, sage, salt, pepper, red bell pepper and chopped spinach with your hands.Roll the mixture into 16 bite-sized balls. A small ice cream scoop will help with this.Place the meatballs on the prepared baking sheet. Drizzle with the extra virgin olive oil.Bake at 325 F 10 minutes then using a tongs flip the balls.Remove from the oven. Serve immediately or cool completely before storing in the fridge.