Line an 8 x 3- inch loaf pan with wax paper or aluminum foil. Brush the
sides, but not the bottom, lightly with butter and sprinkle the pumpkin seeds
in the bottom.
Whisk the maple syrup, brown sugar, cream, corn syrup, pie spice, lemon
juice and salt together in a heavy bottom medium saucepan. Brush down the sides
on the saucepan with water to remove every grain of sugar. Set a candy thermometer
into the sugar. Cook the mixture over medium heat, without stirring, until the
mixture reaches the firm ball stage, 248 degrees F, about 18 to 20 minutes.
Carefully stir in the pumpkin puree. Return to the heat and cook, stirring
occasionally, until the caramel reaches the soft ball stage, 240 degrees F,
about 15 minutes more.
Remove from the heat and stir in butter and vanilla extract.
Pour the caramel over the pumpkin seeds in the prepared pan. Smooth to an
even layer. Cool to room temperature.
When fully cooled, peel from the wax paper or foil and cut into 24 (1-inch)
Wrap individually in parchment or wax paper and store in an airtight container
for up to a week.