Step 1: Make the Dough - In a mixing bowl, combine the flour and yeast. In a saucepan, heat the milk and butter over low heat until the butter melts. Remove the pan from the heat and cool the mixture to lukewarm. Add the lukewarm milk mixture and egg to the flour mixture and stir until a stiff dough forms. Cover the bowl with plastic wrap and let rest for 30 minutes. - Be sure to let the milk mixture cool to lukewarm before adding it to the flour, as hot milk can kill the yeast and prevent the dough from rising properly.

Step 2: Make the Stroop Filling - While the dough is resting, make the stroop filling. In a saucepan, combine the brown sugar, cinnamon, corn syrup, and 1/2 cup water. Heat the mixture over medium heat until the brown sugar dissolves, then increase the heat to high and bring the mixture to a boil. Reduce the heat to medium and continue cooking the mixture, stirring occasionally, until it thickens and reaches the softball stage (approximately 235-240°F on a candy thermometer). Remove the pan from the heat and let the mixture cool slightly. - Be sure to watch the stroop filling carefully as it cooks to prevent it from boiling over, and use caution when handling hot sugar as it can cause burns.

Step 3: Roll and Cut the Dough - Preheat an electric waffle iron. On a floured surface, roll out the dough to a thickness of 1/4 inch. Cut the dough into rounds using a cookie cutter or the rim of a drinking glass. Place the rounds on a parchment-lined baking sheet and let rest for 5 minutes. - If you don't have a cookie cutter or drinking glass, you can use a sharp knife to cut the dough into squares instead.

Step 4: Cook the Waffles - Place a dough round in the preheated waffle iron and cook for 30-45 seconds, or until the waffle is golden brown and crisp. Remove the waffle from the iron and immediately cut it in half horizontally using a sharp knife. Spread a generous amount of stroop filling on the bottom half of the waffle and top with the other half. Press gently to spread the filling and seal the waffle. - Be sure to work quickly when spreading the stroop filling, as it will thicken as it cools and become harder to spread.

Step 5: Enjoy! - Repeat cooking and filling the remaining waffles as directed. Serve the stroopwafels warm with a cup of coffee or tea, and enjoy. -