Peanut Butter Cup Surprise Monster Cookies

Bahan-bahan (18 porsi)

• 3/4 cup (94g) all-purpose flour (spooned & leveled)
• 1/4 teaspoon salt
• 1/2 teaspoon baking soda
• 1/2 cup (8 Tbsp; 113g) unsalted butter, melted
• 1 cup (200g) packed light or dark brown sugar
• 1 large egg, at room temperature
• 1/2 cup (125g) creamy peanut butter (not natural style)
• 2 teaspoons pure vanilla extract
• 2 cups (170g) quick oats*
• 1 and 1/4 cups mini or regular size M&Ms
• 18 Reese’s miniature peanut butter cups, unwrapped