Any weight gain in quarantine (for some just a few pounds, for others a bit more) should not keep you worried as it can be easily lost if you just follow some day to day, simple and reasonable advice.
Breakfast- Champions’ Meal
I know it sounds cliché, but DON’T skip breakfast! Systematize your breakfast intake so that you gradually boost your metabolism and therefore your calorie burning ability, and don’t fall head over heels for the next bigger meals. Ideas for healthy breakfasts: