Peanut Butter Ice Cream

1 can sweetened condensed milk
1 1/2 cups sugar
4 eggs, beaten
1 tablespoon vanilla flavoring
2 quarts milk (divided)
1 cup chunky peanut butter

Combine condensed milk, sugar, eggs, vanilla, and 1 quart milk.
Heat in microwave; let cool. When cooled, add peanut butter
and 1 quart milk. Mix well. Pour into freezer and freeze.