Preheat oven to 350°F. Cook pasta in pot of salted boiling water for 2 minutes less than instructed on package. Melt butter over medium heat in heavy bottom sauce pan. Sprinkle flour into butter, whisk to combine and cook for 2-3 minutes. Once golden brown and smooth, slowly whisk in half and half and simmer for 6-8 minutes, stirring often to prevent clumps.
Whisk in lemon zest, oregano and Bellatini Formaggio. Continue to cook, stirring constantly, until cheese has completely melted and sauce is thick and smooth, about 3-4 minutes.
Once sauce and pasta are ready, combine two in large bowl. Stir in red peppers, olives, pepperoncini, parsley and Feta.
Butter 8 ramekins and place on cookie sheet. Spoon mac and cheese mixture into ramekins and sprinkle with pita chips.
Bake mac and cheese for 20 minutes and serve immediately.