Heat 1 tbsp olive or avocado oil in a skillet over medium-high heat. When the pan is hot, add the diced onion and carrot. Cook for 3 minutes, add Italian seasoning, salt and pepper to taste.
Add minced garlic and cook until fragrant, about 1 minute.
Add the onion mixture to your crockpot.
Add lentils, can of diced tomatoes w Italian seasoning, can of fire roasted tomatoes, can of tomato paste, mushrooms, red pepper flakes, water or red wine, salt and pepper to taste.
Cook on high for 4 hours or on low for 8 hours.
Cook pasta as per box instructions, top with bolognese and serve.