I have no idea how I found the blog where I saw this recipe, but Delicious Meliscious is a great source of new recipes at my house!
1 cup (2 sticks) unsalted butter, room temperature
3 cups all-purpose flour, plus more for pan
1 1/2 cups sugar
2 large eggs
2 1/2 cups creamy peanut butter
1 1/2 teaspoons salt
1 teaspoon baking powder
1 teaspoon vanilla extract
2 cups strawberry jam
2/3 cup salted peanuts, roughly chopped
Heat oven to 350 degrees. Grease a 9×13-inch pan with cooking spray and flour; set aside.
Place butter and sugar in the bowl of an electric mixer. Beat on medium-high speed until fluffy, about 2 minutes. On medium speed, add eggs and peanut butter; beat until combined, about 2 minutes.
Sift together salt, baking powder, and flour. Add to bowl of mixer on low speed; combine. Add vanilla.
Transfer two-thirds of mixture to prepared pan; spread evenly with spatula. Using spatula, spread jam on top of peanut-butter mixture. Crumble remaining third of peanut-butter mixture on top of jam. Sprinkle with peanuts.
Bake until golden, about 45 minutes. Transfer to a wire rack to cool;