Of course! It's best to wait until your body is 'fat adapted' (usually 2-3 months after starting a ketogenic diet) before having occasional high carb treats or meals. Enjoy the indulgence and return to your diet right after. If you are on a keto diet long term, you may be able to increase your carb intake to close to 50 carbs per day and still maintain ketosis. And, you'll return to ketosis faster after having a 'cheat' day.