
Line a large baking sheet with parchment paper and set aside.
Melt the butter in a medium saucepan over medium-low heat. Add the granulated sugar, corn syrup, and maple syrup. Stir continuously until fully combined.
Increase the heat to medium and bring to a gentle simmer. Stirring continuously, bring the mixture to 250℉, about 7-10 minutes.
Stir in the pepitas, cinnamon, nutmeg, and cloves. Continue stirring until it reaches 275℉, about 10 minutes. Remove the pan from the heat and stir in the vanilla extract and baking soda.
Carefully pour the brittle mixture onto the lined baking sheet and quickly spread the brittle into an even layer. Top with flaky sea salt if desired.
Allow the brittle to cool completely at room temperature for 3 hours, or in the refrigerator for 2 hours. Break apart into pieces and serve.