A further application is for applying streusel or other dry topping to muffins.
Here's a convenient video!
Step 1: Use a Canning Funnel
A wide canning funnel fits exactly into a muffin cup.
Step 2: Spoon in the Batter
You can add batter, and even adjust the level afterwards. The funnel holds the paper muffin cup in place, even with a sticky batter.
Step 3: Add Dry Topping
A clean funnel can be used to add a dry topping (pecan streusel is shown here) or fruit.
Step 4: Muffins!