Heat oven to 350°F and grease 12-muffin tin with nonstick cooking spray.
In medium saucepan, stir together quinoa and 1 cup milk. Bring to boil over medium heat. Reduce to simmer, cover and cook 10-15 minutes until quinoa is tender and milk is absorbed.
In large bowl, combine flour, brown sugar, baking powder and salt; whisk to combine. In medium bowl, combine remaining milk, Greek yogurt, eggs, vanilla and peanut butter; mix well. Add wet ingredients to dry ingredients and mix until combined. Stir in cooked quinoa. Divide batter among muffin cups.
Drop 1/2 teaspoon of strawberry preserves into center of each muffin tin on top of batter. Bake 20-25 minutes until an inserted toothpick comes out clean.
Allow to cool 5-10 minutes. Serve with 8-ounce glass of milk.