Flutter how do I remove unwanted padding from Text widget?

The proper way you can get rid of the unwanted padding is by setting the height property in the TextStyle. With this you set the height for each line.

                  Text(
                    "Let's make\nsome pancakes",
                    style: TextStyle(
                      height: 1.2, //SETTING THIS CAN SOLVE YOUR PROBLEM
                      color: Colors.white,
                      fontSize: 20,
                      fontWeight: FontWeight.w300,
                    ),
                    textAlign: TextAlign.center,
                  ),

In fact, we can confirm from the docs that:

For most fonts, setting height to 1.0 is not the same as omitting or setting height to null because the fontSize sets the height of the EM-square, which is different than the font provided metrics for line height.

For more info: https://api.flutter.dev/flutter/painting/TextStyle/height.html

So give it a try. It worked for me.