Into a saucepan over high heat, add Granulated Sugar (1 cup), Light Corn Syrup (1/2 cup), Maple Syrup (1/2 cup), and Water (1/4 cup). Swirl the pan to mix slightly. Cover with a lid and let sit for 2 minutes, stirring gently once or twice.
Bring mixture to a boil. Let sit for 5 minutes at a boil.
Place a thermometer in the mixture and wait for it to come to a soft-crack stage, about 270 degrees F (132 degrees C).
Add Dry Roasted Peanuts (1 cup). Mix well.
Add Butter (1/2 cup). Mix well. Return the thermometer to the pan and continue to cook until mixture reaches a hard-crack stage, 300 degrees F (148 degrees C). Remove from heat.
Add Baking Soda (1/2 teaspoon) and Vanilla Extract (1 teaspoon). Mix to combine, then transfer mixture to a 9x12-inch baking pan. Smooth the top.
Let peanut brittle rest for a few hours or overnight. Use a knife to break it up when ready to serve.