1. Line a baking sheet with parchment paper and draw small heart templates underneath as a guide.

2. Sift together powdered sugar and almond flour; set aside.

3. In a clean bowl, beat egg whites until foamy, then gradually add granulated sugar and whip to stiff peaks.

4. Add vanilla and gel food coloring; gently mix until combined.

5. Fold in the dry ingredients carefully until the batter flows like lava.

6. Transfer batter to a piping bag and pipe heart shapes onto the prepared sheet.

7. Tap the baking sheet firmly to release air bubbles and let rest 30–45 minutes until a skin forms.

8. Bake at 300°F (150°C) for 14–16 minutes; cool completely before removing.

9. Prepare filling by beating butter, powdered sugar, cream, and vanilla until smooth.

10. Pipe filling onto one shell and sandwich with another. Chill for 24 hours for best texture before serving.