Slow Cooker Marinara Sauce

Name: Slow Cooker Marinara Sauce
Prep time: 5 min
Cook time: 8 h
Total time: 8 h 5 min
Cuisine: Mediterranean, Italian, European
Ingredients: 3 cans 28 oz crushed tomatoes; 2 14.5 oz cans fire roasted diced tomatoes (drained ); 8 garlic cloves (minced); 1 yellow large onion (diced); 2 tbsp dried oregano; 2 tbsp dried basil; 1/4 tsp red pepper flakes (more or less depending on the level of spice you'd like); 1-½ tsp kosher salt; 1 teaspoon pepper; 1-2 bay leaves ((optional))