Whisk together 2 cups milk, 2 cups chicken stock (or water), 1 bay leaf, and 1 cup polenta in a heavy-bottomed pot. These photos show me making a double batch of polenta cakes, your batch will look smaller. **If you are serving creamy polenta see 2nd note below**
Turn the heat to high and whisk continuously until the liquids come to a simmer. The polenta should start to thicken once simmering. After the polenta starts to simmer, turn the heat down to low and season with 2 tsp kosher salt, or to taste. Note that you will be adding salty cheese later so you may want to slightly under-season at this point.
Put a lid on the pot and allow the polenta to cook at a gentle simmer on low or medium-low heat for 30 minutes. Check the polenta every 5-10 minutes while it is cooking and scrape the bottom of the pot to ensure the polenta does not scorch.
Remove and discard the bay leaf and add1.5 oz grated parmesan, 1 tsp chopped thyme, and 6-8 grinds of black pepper. stir everything together. Adjust seasoning if necessary
Polenta should be thick, not loose or runny.
Line a 7" x 7" square pan with plastic wrap. Leave extra plastic wrap overhanging so you can fold it on top of the polenta cake. If you dont have a 7x7 pan, you can use almost any other container to form the polenta cake, just try to make it so that the polenta is not more than 1" thick when you pour it in. ( In the photo I am using a 10" x 12" pan because I am making a double batch)
Pour the hot polenta into the pan and smooth the top with a spatula.
Fold the excess plastic wrap on top of the polenta. Use additional plastic wrap if necessary to totally cover the top of the polenta cake. Press and smooth the top of the polenta cake after covering. Place the polenta cake in the refrigerator for 6 hours or in the freezer for 2 hours if you are in a rush.
After polenta has cooled, it should have firmed up and should easily pop out of the pan.
Cut the polenta into 4 squares and keep covered in the refrigerator until ready to use. The following recipe will only use one polenta cake and will feed 2-4 people as an appetizer or side dish. Leftovers can be kept in the fridge for up to 4 days. Polenta cakes go very well with fried eggs and hot sauce for breakfast.