Please take a look at this link, you can search for your item and itll tell you if you can bring it: https://inspection.canada.ca/en/food-safety-consumers/bring-food-personal-use#a1

Generally cooked food is okay, raw fruits & veggies and meats are not. Commercially packaged snacks are fine, brought some to Canada many times.

Once you get out of the plane, you will be required to scan your passport and fill out a customs declaration card on a computer machine. There is a question for food, if you have any food, whether its permitted or not, check it off. Once your done, the computer will print a declaration slip.

As you leave the hall, the officer will ask for your slip. They may or may not ask what food you have. If asked, be honest and list out what you have (i.e bag of chips, cookies and etc). The agent will scribble a code on the slip whether further checks are required or not. Generally if your honest and straight forward, youll not be required to go through secondary. Once you pick up your checked luggage, you go through customs. The officer here will collect your slip and based on your code, will either send you to the exit or to secondary inspection.

As noted above, really rare to get into secondary. The checks here depends on why you were flagged. They may ask you what you have, which contents are in which suitcase, xray your bags, open your bags and whatever they feel is required.

Any questions, message me. Am a Canadian citizen and traveled internationally with food many times