Prepare a Flat Surface: Line a sheet pan, cutting board, or marble pastry board with parchment paper. Alternatively, use a silicone baking mat or foil greased with cooking spray or butter. Then, grease a spoon with butter for later use in scooping the praline mixture onto the pan.
Cook the Mixture: In a sturdy medium saucepan, combine the butter, granulated sugar, and evaporated milk. Set it over medium heat, about 275°F on a programmable induction cooktop.
Stir and Add Vanilla: Stir cream and sugar mixture until the sugar dissolves. Then, add vanilla.
Soft Ball Stage: Continue to cook, stirring constantly with a sauce whisk (preferred) or silicone spatula, until it reaches the "soft ball" stage at 230°F to 235°F. Use a candy thermometer for accuracy. The time it takes will vary depending on the humidity and type of saucepan. See notes below.
Add Pecans: Once the temperature hits 230°F to 235°F, add the chopped pecans. Continue stirring until the mixture begins to thicken (see video above), about 5 to 7 minutes. Reduce heat if necessary to avoid scorching.
Cool and Scoop: Quickly remove the saucepan from heat and use the pre-greased spoon to scoop spoonfuls onto the prepared sheet pan. The praline mixture thickens rapidly, so work quickly.
Cool and Harden: Allow the pralines to cool completely and harden on the sheet pan, approximately 2 hours.
Store: Store leftovers in an airtight container; best consumed within 3 days.
Notes
Checking for Doneness: To check if the candy is ready to be dropped onto the parchment paper, drop a small amount into ice-cold water. If it forms a soft ball that can be easily flattened between your fingers, it's ready! This stage is known as the "soft-ball" stage in candy making.
Temperature and Humidity: My kitchen was around 57% humidity and 74°F in the middle of summer when I tested this recipe. Starting at Step 2 through Step 6 took around 45 minutes.