Prep the apples. Core and slice the apples into 1/4-inch wedges.
Thinner slices cook faster; thicker slices stay firmer. Peel them if you want a softer texture.
Warm the skillet. Place a large skillet over medium heat. Add the butter and let it melt until foamy.
Start the apples. Add the apple slices and a pinch of salt.
Stir to coat with butter. Cook for 2–3 minutes until the edges look slightly glossy.
Add flavor. Sprinkle in the cinnamon and brown sugar. Stir to combine so every slice gets a little spice and sweetness.
Create a light syrup. Pour in 2 tablespoons of water or apple cider.
The liquid will help dissolve the sugar and make a glossy coating. If the pan looks dry, add another tablespoon as needed.
Simmer to tender. Reduce heat to medium-low and cook for 5–8 minutes, stirring occasionally, until the apples are tender but not mushy. Adjust time based on slice thickness and apple variety.
Finish with vanilla. Turn off the heat.
Stir in the vanilla extract and, if using, a small squeeze of lemon to brighten the flavor.
Serve warm. Enjoy as-is or spoon over oatmeal, pancakes, yogurt, waffles, pork chops, or ice cream. For crunch, sprinkle with chopped nuts.