Make the cinnamon whipped cream before the waffles, so it's ready to go while the waffles are still hot.
Put all the ingredients into a bowl and whip together until stiff peaks form. It's easiest to use a stand mixer or electric whisk for this.
Make the Cinnamon Waffles
Turn your waffle iron on to its maximum heat setting and let it preheat while you mix together the ingredients.
Put the melted butter in a bowl with the milk, eggs, lemon juice, and vanilla and whisk together until combined.
Add the remaining ingredients and whisk together until there are no more lumps.
Melt some more butter in the microwave and use a food-safe pastry brush to brush a thin layer all over the waffle iron. You don't need the butter to prevent sticking, but it does help to make the outside of the waffle nice, brown and caramelized.
Scoop some of the waffle batter into the waffle iron, just enough that it can be spread to the edges of the iron. Don't overfill it or it will drip down the edges.
Close the waffle iron and let it cook for a few minutes. Cooking time will vary between waffle irons, but after 3 or 4 minutes, you can gently test to see if you can easily open the waffle iron, if there is any resistance, the batter is still raw. Once you can open it, take a peek to see if it's the color you want it, close again and keep cooking if you'd like it to be darker.
Gently remove from the waffle iron and serve while hot.
Notes
Make sure you make the cinnamon whipped cream before you start the waffles so you can serve them together while the waffles are still hot. For a little more heat, you could add ½ teaspoon of ginger and/or nutmeg to the waffle batter as well for a more festive flavor.