Creating Raspberry Mousse is straightforward if you follow these simple steps:

1. Prepare Raspberries: Rinse the raspberries under cold water and allow them to dry completely.
2. Blend Raspberries: In a blender, combine the raspberries, granulated sugar, and lemon juice. Blend until smooth.
3. Strain Mixture: Pour the blended raspberry mixture through a fine-mesh sieve into a bowl to remove seeds.
4. Whip Cream: In a separate bowl, whip the heavy cream and vanilla extract until soft peaks form.
5. Sweeten Cream: Gradually add the powdered sugar to the whipped cream and continue whipping until firm peaks form.
6. Combine Mixtures: Fold the raspberry puree gently into the whipped cream until just combined. Be careful not to deflate the whipped cream.
7. Add Gelatin (Optional): If using gelatin, dissolve it in warm water according to package instructions. Fold it into the raspberry mixture for a firmer texture.
8. Chill: Spoon the mousse into serving glasses and refrigerate for at least 2-3 hours, or until set.
9. Garnish (Optional): Before serving, you can garnish with additional raspberries or a dollop of whipped cream.

These steps will guide you in creating this incredible dessert effortlessly.