While you cook your pasta of choice you can prepare the avocado sauce. Start by cutting the avocado in half, removing the seed and scooping the rest into a bowl. Discard the peel.
Add in lemon juice, olive oil, garlic and the greek yogurt. Sprinkle with the rest of the seasonings.
Mash up the avocado with a fork as best as possible, then stir everything together. Heat the contents of the bowl slightly in the microwave and then stir again. Continue to reheat and stir as needed until well blended.