Peanut Brittle

Ingredients (8)

• 4 teaspoons plus 1/4 cup butter, divided
• 3 cups sugar
• 1/2 cup light corn syrup
• 1 cup plus 1 teaspoon water, divided
• 1 teaspoon salt
• 1 jar (16 ounces) unsalted dry roasted peanuts
• 1-1/2 teaspoons baking soda
• 1 teaspoon vanilla extract