Preheat the oven to 350°F (176°C). Line a 12-cup muffin pan with paper liners or lightly grease the pan.
In a large mixing bowl, combine the flaxseed meal and water. Let it sit for about 5 minutes to form flax eggs.
Add the maple syrup, coconut sugar, and melted oil. Whisk until smooth.
Stir in the applesauce, peanut butter, sea salt, baking soda, baking powder, and apple cider vinegar until fully combined.
Mix in the almond milk.
Fold in the gluten-free flour blend, almond meal, and rolled oats. Stir just until combined. The batter should be thick enough to scoop rather than pour.
Divide the batter evenly among the muffin cups, filling each about three-quarters full.
Top each muffin with about 3/4 teaspoon strawberry jam and a small dollop of peanut butter. Use a toothpick to gently swirl the toppings into the batter.
Bake the Peanut Butter and Jelly Muffins for 26–32 minutes, or until a toothpick inserted into the center comes out mostly clean.
Allow the muffins to cool in the pan for 20 minutes before transferring them to a cooling rack to cool completely.