1-First Step: Preheat your oven to 350°F and line two baking sheets with parchment paper. This prevents sticking and ensures even baking for crisp Twix cookies. Soften 1 cup unsalted butter to room temperature for easy creaming. Gather all ingredients to streamline the process, especially for busy parents.

2-Second Step: In a large bowl, cream 1 cup softened butter and ½ cup powdered sugar with a mixer on medium speed for 2 minutes until light and fluffy. This incorporates air for tender shortbread. Add 2 cups all-purpose flour, ½ tsp vanilla extract, and ¼ tsp salt. Mix on low until a soft dough forms, about 1 minute. Avoid overmixing to keep cookies tender. For gluten-free, swap flour here.

3-Third Step: Scoop dough into 1-inch balls using a cookie scoop or tablespoon. Roll gently between palms for smooth rounds. Place 2 inches apart on prepared sheets. Use your thumb or the back of a spoon to press a deep indent into each center, about halfway through the ball. This creates the perfect well for caramel. Chill trays for 30 minutes if dough softens in warm kitchens, helping thumbprint cookies hold shape.

4-Fourth Step: Bake one sheet at a time in the center rack for 12-15 minutes. Edges turn light golden brown while centers stay pale. Do not overbake to maintain softness. Remove from oven and cool on sheets for 10 minutes, then transfer to a wire rack. Indents may puff slightly; gently repress if needed while warm.

5-Fifth Step: Spoon or pipe 1 tsp caramel sauce or dulce de leche into each cooled indent. For homemade, simmer ½ cup sugar to amber, stir in ¼ cup butter and ½ cup heavy cream off heat, then ½ tsp salt. Cool slightly before filling. Vegan? Use coconut-based caramel.

6-Sixth Step: Melt 1 cup milk chocolate chips in a microwave-safe bowl in 30-second bursts, stirring between. Drizzle over filled cookies using a fork or piping bag. Sprinkle flaky sea salt immediately. Let set at room temperature for 30 minutes or chill briefly. For low-calorie, use dark chocolate sparingly.

7-Final Step: Serve once set. Pair with milk for the full Twix experience. These easy Twix thumbprint cookies store well and impress at parties. Troubleshooting: If dough cracks, add 1 tsp milk. For holidays, add sprinkles post-drizzle.