Very tasty. Normally I don't care for spaghetti, it's a bit sweet for my taste. The rest of the ingredients did a great job of making it's flavour much more savoury. I didn't add the pepper flakes or Italian seasoning or the garlic salt. I did add fresh minced garlic and doubled the pesto. I didn't add more butter or the olive oil as my pesto was relatively oily. I grated the cheese on top when serving. Served it with ground pork rind breaded chicken thighs for a very diabetic friendly meal. We'll definitely be having this again!