Activate Yeast : In a small bowl, combine warm water, sugar, and yeast. Let sit for 5 minutes until foamy.
Make Dough : In a large mixing bowl, combine flour and salt. Pour in yeast mixture and melted butter. Mix until a sticky dough forms.
Knead Dough : Knead on a floured surface for 5–7 minutes until smooth and elastic.
First Rise : Place dough in a greased bowl, cover with a towel, and let rise for 1 hour or until doubled in size.
Preheat Oven : Set oven to 425°F (220°C). Line a baking sheet with parchment paper.
Shape Pretzels : Punch down dough and divide into 8 pieces. Roll each piece into a rope and shape into a pretzel.
Boil Pretzels : In a large pot, bring water and baking soda to a boil. Boil each pretzel for 30 seconds, then transfer to prepared baking sheet.
Bake : Bake for 12–15 minutes until golden brown.
Add Topping : Brush warm pretzels with melted butter. Mix sugar and cinnamon in a small bowl and sprinkle generously over each pretzel.
Cool and Serve : Allow to cool slightly before enjoying warm.