Brownies With Peanut Butter Topping

• 3 eggs
• 300 gr firmly packed brown (light)
• 170 gr butter
• 130 gr peanuts (unsalted)
• 130 gr sifted all-purpse flour
• 65 gr unsweetened cocoa powder
• 4 gr vanilla
• 2 gr baking soda
• 1 gr salt
• 1 package peanut butter chips