Activate yeast: Combine warm water, active dry yeast, and sugar in a bowl, stir, and let sit for 5-10 minutes until foamy.

Mix dough: Whisk flour and salt together, then add yeast mixture and melted butter. Stir until combined.

Knead dough: Turn dough onto a floured surface and knead for 5-7 minutes until smooth.

Let rise: Place dough in a greased bowl, cover, and let rise in a warm place for 1-1.5 hours.

Shape pretzels: Punch dough down, divide, roll each piece into a rope, and shape into pretzels.

Boil pretzels: Boil water with baking soda, add pretzels one at a time and cook for 30 seconds per side.

Prepare for baking: Remove from water, place on parchment-lined sheet, brush with egg, and sprinkle cinnamon sugar.

Bake: Preheat oven to 375°F and bake for 12-15 minutes until golden brown.