Easy Paleo Pesto Baked Chicken {Whole30}

Name: Easy Paleo Pesto Baked Chicken {Whole30}
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 1 cup raw shelled walnuts; 3 cups fresh basil leaves; 2 cups fresh baby spinach leaves; 4 cloves garlic; 2/3 cup light flavored olive oil; 3/4 tsp salt (you can adjust to your taste); 2 tbsp nutritional yeast**; 1.5 lbs organic boneless skinless chicken breasts; sea salt & pepper; 4 slices tomato; generous pinch Italian seasoning (I used this one); generous pinch nutritional yeast**