Prepare the cinnamon filling: In a medium bowl, stir together the butter, brown sugar and cinnamon. Scoop the filling into a quart-sized heavy zip baggie and set it aside

Prepare the glaze: In a small pan, heat the butter over low heat until melted. Turn off the heat and whisk in the cream cheese until it is almost smooth. Sift the powdered sugar into the pan, stir and add in vanilla extract. Set the pan aside while you make the pancakes.

Prepare the pancake batter: In a medium bowl, whisk together the flour, baking powder and salt. Whisk in the milk, egg and oil, just until the batter is moistened (a few small lumps are fine).

Cook the pancakes: Heat a large, nonstick skillet over medium-heat and spray with nonstick spray.

Slide a thin, wide metal spatula underneath the pancake and gently but quickly flip it over. Cook an additional 2 to 3 minutes, until the other side is golden as well.

Re-warm the glaze briefly, if needed. Serve pancakes topped with a drizzle of glaze.

*Tips for the cinnamon filling: Before swirling, open up the baggie again and give it a good stir to re-incorporate any butter that may have separated from the sugar. You want the mixture to thicken a bit- it's best when it's similar to the squeezing texture of a tube of toothpaste, which will happen if you leave it at room temperature for several minutes. Don't try to use the filling for the pancake swirl unless it has thickened as it will be too runny to make a solid swirl.
*Keep the heat low or your pancakes might cook up too quickly. Don't flip them until you see those bubbles starting to pop on top. Flip them with a wide spatula so you can grasp the whole thing without batter and filling dripping all over the place!