Place hard-boiled eggs, cream cheese, shredded cheddar, granulated garlic, Dijon mustard, lemon juice, turmeric, salt, and pepper into a food processor.
Blend until mostly smooth, scraping down sides as needed.
Add 1 to 2 teaspoons warm water and blend until the mousse is silky and pipeable.
Transfer mousse into a piping bag and refrigerate for 15 to 20 minutes to set.
Preheat oven to 205°C (400°F). Lightly brush baguette slices with olive oil and arrange on a baking sheet.
Toast slices for 7 to 10 minutes until golden and crisp.
Rub toasted crostini with the cut side of a garlic clove to infuse flavor.
Spread a thin layer of mousse on each crostini, then pipe a decorative swirl on top.
Roll smoked salmon slices into rosettes and place on mousse.
Garnish with fresh dill sprigs and a pinch of black sesame seeds.